Human monoclonal antibodies to ganglioside GD2

ABSTRACT

The present invention provides compositions for the production of an antibody or functional fragment thereof directed against disialoganglioside-GD2. The compositions of the invention include polynucleotides encoding a heavy chain and/or a light chain variable domain that binds to GD2. The invention also provides an isolated antibody or functional fragment thereof and methods of treating or preventing a disease, such as cancer or tumor formation, wherein the antibody or functional fragment includes a variable heavy chain domain and a variable light chain domain that has an amino acid sequence provided herein. The invention further provides a conjugate of an antibody or functional fragment thereof conjugated or recombinantly fused to a diagnostic agent, detectable agent or therapeutic agent, and methods of treating, preventing or diagnosing a disease in a subject in need thereof.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of application Ser. No. 14/730,036, filed Jun. 3, 2015, which claims the benefit of U.S. Ser. No. 62/007,874 filed Jun. 4, 2014, each of which the entire contents are incorporated herein by reference.

SEQUENCE LISTING

The instant application contains a Sequence Listing which has been submitted electronically in ASCII format and is hereby incorporated by reference in its entirety. The ASCII copy, created on Dec. 12, 2017, is named 12967-045-999_Sequence_Listing.txt and is 69,277 bytes in size.

BACKGROUND OF INVENTION

The present invention relates generally to antibodies directed against the disialoganglioside GD2. More specifically, this application relates to polynucleotides encoding human anti-GD2 antibodies and the corresponding encoded antibodies or fragment thereof, as well as to the use of such antibodies for diagnostic or therapeutic purposes. GD2 is attractive for tumor-specific therapies such as antibody therapy because of the tumor selective expression pattern. Currently, several anti-GD2 antibodies have been developed, such as murine anti-GD2 antibodies, human-mouse chimeric anti-GD2 antibodies. However, these antibodies still have undesirable immune effects. Thus, there remains a need to reduce the undesirable immune effects and enhance desirable antitumor effects of the anti-GD2 antibodies. This application discloses human monoclonal antibodies (mAbs) against GD2, which satisfy the need and provide related advantages.

SUMMARY OF INVENTION

In accordance with the present invention, herein provided are compositions for producing antibodies or functional fragments thereof that bind GD2. The compositions include an isolated polynucleotide encoding an antibody or a functional fragment thereof, wherein the antibody includes a variable heavy chain (VH) domain that has complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) provided herein. In one aspect, the isolated polynucleotide of the invention can also encode an antibody or a functional fragment thereof, wherein the antibody includes a VH domain that has an amino acid sequence provided herein. In another aspect, the isolated polynucleotide of the invention can also include a nucleic acid sequence provided herein, wherein the nucleic acid sequence encodes the VH domain of the antibody or functional fragment thereof.

In another embodiment of the invention, the isolated polynucleotide can encode an antibody or a functional fragment thereof, wherein the antibody includes a variable light chain (VL) domain that has complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) provided herein. In one aspect, the isolated polynucleotide of the invention can also encode an antibody or a functional fragment thereof, wherein the antibody includes a VL domain that has an amino acid sequence provided herein. In another aspect, the isolated polynucleotide of the invention can also include a nucleic acid sequence provided herein, wherein the nucleic acid sequence encodes the VL domain of the antibody or functional fragment thereof.

The compositions of the invention also include an isolated antibody or functional fragment thereof, wherein the antibody binds to GD2. In some embodiments, the invention provides an isolated antibody or functional fragment thereof that binds GD2, wherein the antibody or functional fragment thereof includes a VH domain having VH CDR1, VH CDR2, and VH CDR3 regions provided herein. In other embodiments, the invention provides an isolated antibody or functional fragment thereof that binds GD2, wherein the antibody or functional fragment thereof includes a VH domain having an amino acid sequence provided herein.

In some embodiments, the invention provides an isolated antibody or functional fragment thereof that binds GD2, wherein the antibody or functional fragment thereof includes a VL domain having VL CDR1, VL CDR2, and VL CDR3 regions provided herein. In other embodiments, the invention provides an isolated antibody or functional fragment thereof that binds GD2, wherein the antibody or functional fragment thereof includes a VL domain having an amino acid sequence provided herein.

In some embodiments, the invention provides an isolated antibody or functional fragment thereof that binds to GD2, wherein the antibody or functional fragment thereof includes both a VH domain and a VL domain, where the VH domain and the VL domain respectively include an amino acid sequence for the respective VH and VL domains of the clonal isolates provided herein.

In some embodiments, the invention provides a conjugate having an antibody or functional fragment provided herein that is conjugated or recombinantly fused to a diagnostic agent, detectable agent or therapeutic agent. In some aspects of the invention, a conjugate of the invention that includes a detectable agent can be used in a method for detecting and/or diagnosing tumor formation is a subject. Such methods can include administering an effective amount of the conjugate to a subject in need thereof.

In some embodiments, the invention provides pharmaceutical compositions having one or more antibody or functional fragment of the invention and a pharmaceutically acceptable carrier. In some aspects, the invention also provides a method for treating or preventing a disease in a subject in need thereof, by administering a therapeutically effective amount of a pharmaceutical composition of the invention. In still another aspect, the invention provides administering a second therapeutic agent concurrently or successively with an antibody or functional fragment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 1B7. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 1 and amino acid sequence of SEQ ID NO: 2. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 2 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 1B7. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 3 and amino acid sequence of SEQ ID NO: 4. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 3 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 2H12. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 5 and amino acid sequence of SEQ ID NO: 6. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 4 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 2H12. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 7 and amino acid sequence of SEQ ID NO: 8. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 5 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 1G2. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 9 and amino acid sequence of SEQ ID NO: 10. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 6 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 1G2. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 11 and amino acid sequence of SEQ ID NO: 12. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 7 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 1E9. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 13 and amino acid sequence of SEQ ID NO: 14. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 8 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 1E9. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 15 and amino acid sequence of SEQ ID NO: 16. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 9 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 1H3. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 17 and amino acid sequence of SEQ ID NO: 18. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 10 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 1H3. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 19 and amino acid sequence of SEQ ID NO: 20. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 11 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 2F5. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 21 and amino acid sequence of SEQ ID NO: 22. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 12 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 2F5. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 23 and amino acid sequence of SEQ ID NO: 24. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 13 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 2F7. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 25 and amino acid sequence of SEQ ID NO: 26. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 14 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 2F7. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 27 and amino acid sequence of SEQ ID NO: 28. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 15 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 2E12. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 29 and amino acid sequence of SEQ ID NO: 30. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 16 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 2E12. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 31 and amino acid sequence of SEQ ID NO: 32. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 17 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 31F9. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 33 and amino acid sequence of SEQ ID NO: 34. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 18 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 31F9V2. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 35 and amino acid sequence of SEQ ID NO: 36. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 19 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 31F9. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 37 and amino acid sequence of SEQ ID NO: 38. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 20 shows the nucleotide sequence and the encoded amino acid sequence of the variable heavy (VH) chain domain of clone 32E2. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 39 and amino acid sequence of SEQ ID NO: 40. The three complementarity determining regions (VH CDR1, VH CDR2 and VH CDR3) are also identified.

FIG. 21 shows the nucleotide sequence and the encoded amino acid sequence of the variable light (VL) chain domain of clone 32E2. The top portion of the figure shows an alignment between the nucleotide sequence of SEQ ID NO: 41 and amino acid sequence of SEQ ID NO: 42. The three complementarity determining regions (VL CDR1, VL CDR2 and VL CDR3) are also identified.

FIG. 22 shows an alignment of the VH regions of human anti-GD2 monoclonal antibodies 1B7 (SEQ ID NO: 2), 2H12 (SEQ ID NO: 6), 1G2 (SEQ ID NO: 10), 1E9 (SEQ ID NO: 14), 1H3 (SEQ ID NO: 18), 2F5 (SEQ ID NO: 22), 2F7 (SEQ ID NO: 26), 2E12 (SEQ ID NO: 30), 31F9 (SEQ ID NO: 34), 31F9V2 (SEQ ID NO: 36), and 32E2 (SEQ ID NO: 40), with the consensus sequence (SEQ ID NO: 43) listed below.

FIG. 23 shows an alignment of the VL regions of human anti-GD2 monoclonal antibodies 1B7 (SEQ ID NO: 4), 2H12 (SEQ ID NO: 8), 1G2 (SEQ ID NO: 12), 1E9 (SEQ ID NO: 16), 1H3 (SEQ ID NO: 20), 2F5 (SEQ ID NO: 24), 2F7 (SEQ ID NO: 28), 2E12 (SEQ ID NO: 32), 31F9 (SEQ ID NO: 38), and 32E2 (SEQ ID NO: 42), with the consensus sequence (SEQ ID NO: 44) listed below.

FIG. 24 shows antibody-dependent cell-mediated cytotoxicity (ADCC) of human anti-GD2 monoclonal antibodies 1B7, 31F9, 31F9V2, 1G2, 2F7, 32E2 and 2H12. The ADCC activities were measured by Promega's reporter assay using engineered Jurket cells as effector cells. Target cells are various tumor cells, including SaO52, H524, Hs578T, TC71, and Lan1-luc.

FIG. 25 shows internalization of human anti-GD2 monoclonal antibodies into H524 cells. H524 cells were grown in the presence of 1B7, 31F9, or 31F9V2 complexed with Hum-ZAP, a saporin-conjugated anti-human IgG. The values were measured and normalized to 100% growth in absence of Fab-ZAP.

FIG. 26 shows internalization of human anti-GD2 monoclonal antibodies into Lan1-luc cells. Lan1-luc cells were grown in the presence of 1B7, 1G2, 2H12, 2F7, 31F9 or 32E2 complexed with Hum-ZAP, a saporin-conjugated anti-human IgG. The values were measured and normalized to 100% growth in absence of Fab-ZAP.

FIG. 27 shows the kinetics of internalization of anti-ganglioside antibodies into H524 (SCLC) tumor cells measured with a pH sensitive reporter by flow cytometry. Cells that internalized the antibodies into the low pH environment of endosomes display a fluorescence measured by flow cytometry.

FIG. 28 shows the kinetics of internalization of anti-ganglioside antibodies into TC-71 (sarcoma) tumor cells measured with a pH sensitive reporter by flow cytometry. Cells that internalized the antibodies into the low pH environment of endosomes display a fluorescence measured by flow cytometry.

FIG. 29 shows the survival of SCID mice engrafted with human SaOS2 (osteosarcoma) xenograft and treated with anti-GD2 antibodies or control.

FIG. 30 shows the growth of human TC-71 (sarcoma) xenograft tumors in SCID mice and treated with anti-GD2 antibodies or control.

DETAILED DESCRIPTION OF THE INVENTION

Gangliosides expressed on the tumor cell surface can be targets for cancer immunotherapy. The compositions provided herein are based, at least in part, on the identification and characterization of human antibodies that were generated from blood lymphocytes of individuals immunized with MabVax vaccines (MabVax Therapeutics, San Diego, Calif.) containing KLH-conjugated GD2L, GD3L and GM2 antigens as described, for example, in U.S. Pat. Nos. 6,936,253; 7,001,601, and 6,916,476. At least 11 antibodies with high affinity for GD2 (1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2, and 32E2) were identified, expressed as recombinant antibodies, and further characterized in in vitro models. Of the eight antibodies tested, six (1B7, 2H12, 2F7, 2E12, 31F9V2, and 32E2) were potent in complement-dependent cytotoxicity (CDC) assays in at least one cancer cell line. All six antibodies tested show significant activity in antibody-dependent cytotoxicity assays with five different cancer cell lines, albeit to different degree. The two antibodies tested (1B7 and 31F9) also showed significantly anti-tumor activity in vivo, in both a survival model and a subcutaneous tumor model. The translational relevance of the invention provided herein is twofold: First, GD2-KLH conjugate vaccine can elicit an anti-GD2 IgG and IgM antibody response in cancer patients and antibody producing cells can be recovered from patient blood samples. Second, the most potent antibodies that were generated in a clinical trial can be preserved and ultimately used as therapeutics, or in the generation of therapeutics, for a target cancer population. The high affinity of the antibodies provided herein and their high effector functions support this translational potential.

As used herein, the term “antibody” is intended to mean a polypeptide product of B cells within the immunoglobulin class of polypeptides that is able to bind to a specific molecular antigen and is composed of two identical pairs of polypeptide chains, wherein each pair has one heavy chain (about 50-70 kDa) and one light chain (about 25 kDa) and each amino-terminal portion of each chain includes a variable region of about 100 to about 130 or more amino acids and each carboxy-terminal portion of each chain includes a constant region (See Borrebaeck (ed.) (1995) Antibody Engineering, Second Edition, Oxford University Press.; Kuby (1997) Immunology, Third Edition, W.H. Freeman and Company, New York). In the context of the present invention, the specific molecular antigen that can be bound by an antibody of the invention includes the target GD2.

The term “human” when used in reference to an antibody or a functional fragment thereof refers an antibody or functional fragment thereof that has a human variable region and/or a human constant region or a portion thereof corresponding to human germline immunoglobulin sequences. Such human germline immunoglobulin sequences are described by Kabat et al. (1991) Sequences of Proteins of Immunological Interest, Fifth Edition, U.S. Department of Health and Human Services, NIH Publication No. 91-3242. A human antibody, in the context of the present invention, can include an antibody that binds to GD2 and is encoded by a nucleic acid sequence that is a naturally occurring somatic variant of the human germline immunoglobulin nucleic acid sequence. Exemplary methods of producing human antibodies are provided in Example I, but any method well known to those skilled in the art can be used.

The term “monoclonal antibody” refers to an antibody that is the product of a single cell clone or hybridoma or a population of cells derived from a single cell. A monoclonal antibody also is intended to refer to an antibody produced by recombinant methods from heavy and light chain encoding immunoglobulin genes to produce a single molecular immunoglobulin species. Amino acid sequences for antibodies within a monoclonal antibody preparation are substantially homogeneous and the binding activity of antibodies within such a preparation exhibit substantially the same antigen binding activity. In contrast, polyclonal antibodies are obtained from different B cells within a population, which are a combination of immunoglobulin molecules that bind a specific antigen. Each immunoglobulin of the polyclonal antibodies can bind a different epitope of the same antigen. Methods for producing both monoclonal antibodies and polyclonal antibodies are well known in the art (Harlow and Lane., Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory Press (1989) and Borrebaeck (ed.), Antibody Engineering: A Practical Guide, W.H. Freeman and Co., Publishers, New York, pp. 103-120 (1991)).

As used herein, the term “functional fragment” when used in reference to an antibody is intended to refer to a portion of the antibody including heavy or light chain polypeptides that retains some or all of the binding activity as the antibody from which the fragment was derived. Such functional fragments can include, for example, an Fd, Fv, Fab, F(ab′), F(ab)₂, F(ab′)2, single chain Fv (scFv), diabody, triabody, tetrabody and minibody. Other functional fragments can include, for example, heavy or light chain polypeptides, variable region polypeptides or CDR polypeptides or portions thereof so long as such functional fragments retain binding activity. Such antibody binding fragments can be found described in, for example, Harlow and Lane, Antibodies: A Laboratory Manual, Cold Spring Harbor Laboratory, New York (1989); Myers (ed.), Molec. Biology and Biotechnology: A Comprehensive Desk Reference, New York: VCH Publisher, Inc.; Huston et al., Cell Biophysics, 22:189-224 (1993); Plückthun and Skerra, Meth. Enzymol., 178:497-515 (1989) and in Day, E. D., Advanced Immunochemistry, Second Ed., Wiley-Liss, Inc., New York, N.Y. (1990).

The term “heavy chain” when used in reference to an antibody refers to a polypeptide chain of about 50-70 kDa, wherein the amino-terminal portion includes a variable region of about 120 to 130 or more amino acids and a carboxy-terminal portion that includes a constant region. The constant region can be one of five distinct types, referred to as alpha (α), delta (δ), epsilon (ε), gamma (γ) and mu (μ), based on the amino acid sequence of the heavy chain constant region. The distinct heavy chains differ in size: α, δ and γ contain approximately 450 amino acids, while μ and ε contain approximately 550 amino acids. When combined with a light chain, these distinct types of heavy chains give rise to five well known classes of antibodies, IgA, IgD, IgE, IgG and IgM, respectively, including four subclasses of IgG, namely IgG1, IgG2, IgG3 and IgG4. A heavy chain can be a human heavy chain.

The term “light chain” when used in reference to an antibody refers to a polypeptide chain of about 25 kDa, wherein the amino-terminal portion includes a variable region of about 100 to about 110 or more amino acids and a carboxy-terminal portion that includes a constant region. The approximate length of a light chain is 211 to 217 amino acids. There are two distinct types, referred to as kappa (κ) of lambda (λ) based on the amino acid sequence of the constant domains. Light chain amino acid sequences are well known in the art. A light chain can be a human light chain.

The term “variable domain” or “variable region” refers to a portion of the light or heavy chains of an antibody that is generally located at the amino-terminal of the light or heavy chain and has a length of about 120 to 130 amino acids in the heavy chain and about 100 to 110 amino acids in the light chain, and are used in the binding and specificity of each particular antibody for its particular antigen. The variable domains differ extensively in sequence between different antibodies. The variability in sequence is concentrated in the CDRs while the less variable portions in the variable domain are referred to as framework regions (FR). The CDRs of the light and heavy chains are primarily responsible for the interaction of the antibody with antigen. Numbering of amino acid positions used herein is according to the EU Index, as in Kabat et al. (1991) Sequences of proteins of immunological interest. (U.S. Department of Health and Human Services, Washington, D.C.) 5^(th) ed. A variable region can be a human variable region.

A CDR refers to one of three hypervariable regions (H1, H2 or H3) within the non-framework region of the immunoglobulin (Ig or antibody) VH β-sheet framework, or one of three hypervariable regions (L1, L2 or L3) within the non-framework region of the antibody VL β-sheet framework. Accordingly, CDRs are variable region sequences interspersed within the framework region sequences. CDR regions are well known to those skilled in the art and have been defined by, for example, Kabat as the regions of most hypervariability within the antibody variable (V) domains (Kabat et al., J. Biol. Chem. 252:6609-6616 (1977); Kabat, Adv. Prot. Chem. 32:1-75 (1978)). CDR region sequences also have been defined structurally by Chothia as those residues that are not part of the conserved β-sheet framework, and thus are able to adapt different conformations (Chothia and Lesk, J. Mol. Biol. 196:901-917 (1987)). Both terminologies are well recognized in the art. The positions of CDRs within a canonical antibody variable domain have been determined by comparison of numerous structures (Al-Lazikani et al., J. Mol. Biol. 273:927-948 (1997); Morea et al., Methods 20:267-279 (2000)). Because the number of residues within a hypervariable region varies in different antibodies, additional residues relative to the canonical positions are conventionally numbered with a, b, c and so forth next to the residue number in the canonical variable domain numbering scheme (Al-Lazikani et al., supra (1997)). Such nomenclature is similarly well known to those skilled in the art.

For example, CDRs defined according to either the Kabat (hypervariable) or Chothia (structural) designations, are set forth in the Table 1 below.

TABLE 1 CDR Definitions Loop Kabat¹ Chothia² Location V_(H) CDR1 31-35 26-32 linking B and C strands V_(H) CDR2 50-65 53-55 linking C’ and C” strands V_(H) CDR3  95-102 96-101 linking F and G strands V_(L) CDR1 24-34 26-32 linking B and C strands V_(L) CDR2 50-56 50-52 linking C’ and C” strands V_(L) CDR3 89-97 91-96 linking F and G strands ¹Residue numbering follows the nomenclature of Kabat et al., supra ²Residue numbering follows the nomenclature of Chothia et al., supra

One or more CDRs also can be incorporated into a molecule either covalently or noncovalently to make it an immunoadhesin. An immunoadhesin can incorporate the CDR(s) as part of a larger polypeptide chain, can covalently link the CDR(s) to another polypeptide chain, or can incorporate the CDR(s) noncovalently. The CDRs permit the immunoadhesin to bind to a particular antigen of interest.

As used herein, the term “isolated” when used in reference to an antibody, antibody functional fragment or polynucleotide is intended to mean that the referenced molecule is free of at least one component as it is found in nature. The term includes an antibody, antibody functional fragment or polynucleotide that is removed from some or all other components as it is found in its natural environment. Components of an antibody's natural environment include, for example, erythrocytes, leukocytes, thrombocytes, plasma, proteins, nucleic acids, salts and nutrients. Components of an antibody functional fragment's or polynucleotide's natural environment include, for example, lipid membranes, cell organelles, proteins, nucleic acids, salts and nutrients. An antibody, antibody functional fragment or polynucleotide of the invention can also be free or all the way to substantially free from all of these components or any other component of the cells from which it is isolated or recombinantly produced.

As used herein, “isotype” refers to the antibody class that is encoded by heavy chain constant region genes. The heavy chains of a given antibody or functional fragment determine the class of that antibody or functional fragment: IgM, IgG, IgA, IgD or IgE. Each class can have either κ or λ light chains. The term “subclass” refers to the minor differences in amino acid sequences of the heavy chains that differentiate the subclasses. In humans there are two subclasses of IgA (subclasses IgA1 and IgA2) and there are four subclasses of IgG (subclasses IgG1, IgG2, IgG3 and IgG4). Such classes and subclasses are well known to those skilled in art.

The terms “binds” or “binding” as used herein refer to an interaction between molecules to form a complex. Interactions can be, for example, non-covalent interactions including hydrogen bonds, ionic bonds, hydrophobic interactions, and/or van der Waals interactions. A complex can also include the binding of two or more molecules held together by covalent or non-covalent bonds, interactions or forces. Binding of an antibody or functional fragment thereof can be detected using, for example, an enzyme-linked immunosorbant assay, a method provided in Example I or any one of a number of methods that are well known to those skilled in the art.

The strength of the total non-covalent interactions between a single antigen-binding site on an antibody or functional fragment and a single epitope of a target molecule, such as GD2, is the affinity of the antibody or functional fragment for that epitope. The ratio of association (k₁) to dissociation (k⁻¹) of an antibody or functional fragment thereof to a monovalent antigen (k₁/k⁻¹) is the association constant K, which is a measure of affinity. The value of K varies for different complexes of antibody or functional fragment and antigen and depends on both k₁ and k⁻¹. The association constant K for an antibody or functional fragment of the invention can be determined using any method provided herein or any other method well known to those skilled in the art.

The affinity at one binding site does not always reflect the true strength of the interaction between an antibody or functional fragment and an antigen. When complex antigens containing multiple, repeating antigenic determinants, such as a polyvalent GD2, come in contact with antibodies containing multiple binding sites, the interaction of antibody or functional fragment with antigen at one site will increase the probability of a reaction at a second site. The strength of such multiple interactions between a multivalent antibody and antigen is called the avidity. The avidity of an antibody or functional fragment can be a better measure of its binding capacity than is the affinity of its individual binding sites. For example, high avidity can compensate for low affinity as is sometimes found for pentameric IgM antibodies, which can have a lower affinity than IgG, but the high avidity of IgM, resulting from its multivalence, enables it to bind antigen effectively.

The specificity of an antibody or functional fragment thereof refers to the ability of an individual antibody or functional fragment thereof to react with only one antigen. An antibody or functional fragment can be considered specific when it can distinguish differences in the primary, secondary or tertiary structure of an antigen or isomeric forms of an antigen. The antibody can be cross-reactive if the binding epitope is present on other antigens.

The term “polynucleotide” refers to a polymeric form of nucleotides of any length, either deoxyribonucleotides or ribonucleotides or analogs thereof. The sequence of a polynucleotide is composed of four nucleotide bases: adenine (A); cytosine (C); guanine (G); thymine (T); and uracil (U) for thymine when the polynucleotide is RNA. Thus, the terms “nucleotide sequence” or “nucleic acid sequence” is the alphabetical representation of a polynucleotide. A polynucleotide can include a gene or gene fragment (for example, a probe, primer, EST or SAGE tag), exons, introns, messenger RNA (mRNA), transfer RNA, ribosomal RNA, ribozymes, cDNA, recombinant polynucleotides, branched polynucleotides, plasmids, vectors, isolated DNA of any sequence, isolated RNA of any sequence, nucleic acid probes and primers. Polynucleotide also refers to both double- and single-stranded molecules. Unless otherwise specified or required, any embodiment of this invention that is a polynucleotide encompasses both the double-stranded form and each of two complementary single-stranded forms known or predicted to make up the double-stranded form. It is understood that the isolated polynucleotides and nucleic acids described herein are directed to non naturally occurring polynucleotides and nucleic acids. Non-naturally occurring polynucleotides and nucleic acids can include, but not limit to, cDNA and chemically synthesized molecules.

The term “encode” or grammatical equivalents thereof as it is used in reference to polynucleotides refers to a polynucleotide in its native state or when manipulated by methods well known to those skilled in the art that can be transcribed to produce mRNA, which is then translated into a polypeptide and/or a fragment thereof. The antisense strand is the complement of such a polynucleotide, and the encoding sequence can be deduced therefrom.

The phrase “therapeutic agent” refers to any agent that can be used in the treatment, management or amelioration of a disease associated with expression of GD2 and/or a symptom related thereto. In certain embodiments, a therapeutic agent refers to an antibody or functional fragment of the invention. In other embodiments, a therapeutic agent refers to an agent other than an antibody or functional fragment of the invention. A therapeutic agent can be an agent which is well known to be useful for, or has been or is currently being used for the treatment, management or amelioration of a disease associated with expression of GD2 and/or one or more symptoms related thereto.

The phrase “diagnostic agent” refers to a substance administered to a subject that aids in the diagnosis of a disease. Such substances can be used to reveal, pinpoint, and/or define the localization of a disease causing process. In certain embodiments, a diagnostic agent includes a substance that is conjugated to an antibody or functional fragment of the invention, that when administered to a subject or contacted to a sample from a subject aids in the diagnosis of cancer or tumor formation.

The phrase “detectable agent” refers to a substance that can be used to ascertain the existence or presence of a desired molecule, such as an antibody or functional fragment of the invention, in a sample or subject. A detectable agent can be a substance that is capable of being visualized or a substance that is otherwise able to be determined and/or measured (e.g., by quantitation).

An “effective amount” is an amount sufficient to effect beneficial or desired results. An effective amount can be administered in one or more administrations, applications or dosages. Such delivery is dependent on a number of variables including the time period for which the individual dosage unit is to be used, the bioavailability of the agent, the route of administration, etc.

The phrase “therapeutically effective amount” as used herein refers to the amount of a therapeutic agent (e.g., an antibody or functional fragment provided herein or any other therapeutic agent provided herein) which is sufficient to reduce and/or ameliorate the severity and/or duration of a given disease and/or a symptom related thereto. A therapeutically effective amount of a therapeutic agent can be an amount necessary for the reduction or amelioration of the advancement or progression of a given disease, reduction or amelioration of the recurrence, development or onset of a given disease, and/or to improve or enhance the prophylactic or therapeutic effect of another therapy (e.g., a therapy other than the administration of an antibody or functional fragment provided herein).

The compound GD2, also known as GD2 ganglioside, ganglioside GD2, and ganglioside G2, is a disialoganglioside with a molecular formula of C74H134N4O32 and a molar mass of 1591.86 g/mol. Gangliosides are acidic glycosphingolipids found on the outer surface of most cell membranes. They can be targets for monoclonal antibodies (mAb) because of the high antigen density, lack of modulation, relative homogeneity in many tumors and the possibility of up-regulation by cytokines. Many tumors have abnormal glycolipid composition and structure. GD2 has been found in a wide spectrum of human tumors, including those of neuroectodermal or epithelial origin, virtually all melanomas, and approximately 50% of tumor samples from osteosarcoma and soft-tissue sarcoma.

In some embodiments, the invention provides an isolated polynucleotide encoding an antibody heavy or light chain or a functional fragment thereof, wherein the antibody heavy or light chain or functional fragment thereof encoded by the polynucleotide of the invention has one or more of the complementarity determining regions (CDRs) depicted in FIGS. 1-21 or listed in Table 2. An antibody or functional fragment thereof that includes one or more of the CDRs can specifically bind to GD2 as described herein. Specific binding to GD2 can include the specificity, affinity and/or avidity as provided in Example I for any of the antibodies provided herein. In some aspects, an antibody or functional fragment thereof encoded by the polynucleotides of the invention can include the complement dependent cytotoxicity (CDC) activity and/or antibody-dependent cell-mediated cytotoxicity (ADCC) activity of any one of the clonal isolates 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 described herein. Methods for assessing the specificity, affinity and/or avidity of an antibody or functional fragment thereof are well known in the art and exemplary methods are provided herein.

In some embodiments, the antibody or functional fragment thereof of the invention includes less than six CDRs. In some embodiments, the antibody or functional fragment thereof includes one, two, three, four, or five CDRs selected from the group consisting of VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2, and/or VL CDR3. In specific embodiments, the antibody or functional fragment thereof includes one, two, three, four, or five CDRs selected from the group consisting of VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2, and/or VL CDR3 of clonal isolates 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 described herein.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy chain (VH) domain having VH CDR1, VH CDR2 and VH CDR3 amino acid sequences, wherein the VH CDR1 amino acid sequence is selected from the group consisting of residues 26-33 of SEQ ID NO: 2; residues 26-33 of SEQ ID NO: 6; residues 26-33 of SEQ ID NO: 10; residues 26-33 of SEQ ID NO: 14; residues 26-33 of SEQ ID NO: 18; residues 26-33 of SEQ ID NO: 22; residues 26-33 of SEQ ID NO: 26; residues 26-33 of SEQ ID NO: 30; residues 26-33 of SEQ ID NO: 34; residues 26-33 of SEQ ID NO: 36; and residues 26-33 of SEQ ID NO: 40; the VH CDR2 amino acid sequence is selected from the group consisting of residues 51-58 of SEQ ID NO: 2; residues 51-58 of SEQ ID NO: 6; residues 51-58 of SEQ ID NO: 10; residues 51-58 of SEQ ID NO: 14; residues 51-58 of SEQ ID NO: 18; residues 51-58 of SEQ ID NO: 22; residues 51-58 of SEQ ID NO: 26; residues 51-58 of SEQ ID NO: 30; residues 51-58 of SEQ ID NO: 34; residues 51-58 of SEQ ID NO: 36; and residues 51-58 of SEQ ID NO: 40; and the VH CDR3 amino acid sequence is selected from the group consisting of residues 97-109 of SEQ ID NO: 2; residues 97-109 of SEQ ID NO: 6; residues 97-108 of SEQ ID NO: 10; residues 97-108 of SEQ ID NO: 14; residues 97-108 of SEQ ID NO: 18; residues 97-108 of SEQ ID NO: 22; residues 97-109 of SEQ ID NO: 26; residues 97-109 of SEQ ID NO: 30; residues 97-110 of SEQ ID NO: 34; residues 97-110 of SEQ ID NO: 36; and residues 97-108 of SEQ ID NO: 40.

In other embodiments, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy chain (VH) domain having VH CDR1, VH CDR2 and VH CDR3 amino acid sequences, wherein the VH CDR1 amino acid sequence is encoded by the nucleic acid sequence selected from the group consisting of residues 76-99 of SEQ ID NO: 1; residues 76-99 of SEQ ID NO: 5; residues 76-99 of SEQ ID NO: 9; residues 76-99 of SEQ ID NO: 13; residues 76-99 of SEQ ID NO: 17; residues 76-99 of SEQ ID NO: 21; residues 76-99 of SEQ ID NO: 25; residues 76-99 of SEQ ID NO: 29; residues 76-99 of SEQ ID NO: 33; residues 76-99 of SEQ ID NO: 35; residues 76-99 of SEQ ID NO: 39; the VH CDR2 amino acid sequence is encoded by the nucleic acid sequence selected from the group consisting of residues 151-174 of SEQ ID NO: 1; residues 151-174 of SEQ ID NO: 5; residues 151-174 of SEQ ID NO: 9; residues 151-174 of SEQ ID NO: 13; residues 151-174 of SEQ ID NO: 17; residues 151-174 of SEQ ID NO: 21; residues 151-174 of SEQ ID NO: 25; residues 151-174 of SEQ ID NO: 29; residues 151-174 of SEQ ID NO: 33; residues 151-174 of SEQ ID NO: 35; residues 151-174 of SEQ ID NO: 39; and the VH CDR3 amino acid sequence is encoded by the nucleic acid sequence selected from the group consisting of residues 289-327 of SEQ ID NO: 1; residues 289-327 of SEQ ID NO: 5; residues 289-324 of SEQ ID NO: 9; residues 289-324 of SEQ ID NO: 13; residues 289-324 of SEQ ID NO: 17; residues 289-324 of SEQ ID NO: 21; residues 289-327 of SEQ ID NO: 25; residues 289-327 of SEQ ID NO: 29; residues 289-330 of SEQ ID NO: 33; residues 289-330 of SEQ ID NO: 35; residues 289-324 of SEQ ID NO: 39.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, wherein the antibody heavy chain or functional fragment includes a variable heavy (VH) chain domain having the VH CDR1, VH CDR2 and VH CDR3 amino acid sequence of the clonal isolate 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy (VH) chain domain, wherein the VH domain has VH CDR1, VH CDR2, and VH CDR3 amino acid sequences selected from the group consisting of residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 2; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 6; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 10; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 14; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 18; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 22; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 26; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 30; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 34; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 36; and residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 40.

In other embodiments, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy (VH) chain domain, wherein the VH domain has VH CDR1, VH CDR2, and VH CDR3 amino acid sequences encoded by nucleic acid sequences selected from the group consisting of residues 76-99, residues 151-174, and residues 289-327 of SEQ ID NO: 1; residues 76-99, residues 151-174, and residues 289-327 of SEQ ID NO: 5; residues 76-99, residues 151-174, and residues 289-324 of SEQ ID NO: 9; residues 76-99, residues 151-174, and residues 289-324 of SEQ ID NO: 13; residues 76-99, residues 151-174, and residues 289-324 of SEQ ID NO: 17; residues 76-99, residues 151-174, and residues 289-324 of SEQ ID NO: 21; residues 76-99, residues 151-174, and residues 289-327 of SEQ ID NO: 25; residues 76-99, residues 151-174, and residues 289-327 of SEQ ID NO: 29; residues 76-99, residues 151-174, and residues 289-330 of SEQ ID NO: 33; residues 76-99, residues 151-174, and residues 289-330 of SEQ ID NO: 35; residues 76-99, residues 151-174, and residues 289-324 of SEQ ID NO: 39.

In another embodiment, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy (VH) chain domain, wherein the VH domain has an amino acid sequence is selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40.

In yet another embodiment, the present invention provides an isolated polynucleotide encoding an antibody heavy chain or a functional fragment thereof, the antibody heavy chain or functional fragment thereof including a variable heavy (VH) chain domain, wherein the VH domain amino acid sequence is encoded by the nucleic acid sequence selected from the group consisting of SEQ ID NO: 1; SEQ ID NO: 5; SEQ ID NO: 9; SEQ ID NO: 13; SEQ ID NO: 17; SEQ ID NO: 21; SEQ ID NO: 25; SEQ ID NO: 29; SEQ ID NO: 33; SEQ ID NO: 35; and SEQ ID NO: 39.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain having VL CDR1, VL CDR2 and VL CDR3 amino acid sequences, wherein the VL CDR1 is selected from the group consisting of residues 27-37 of SEQ ID NO: 4; residues 27-37 of SEQ ID NO: 8; residues 27-38 of SEQ ID NO: 12; residues 27-38 of SEQ ID NO: 16; residues 27-38 of SEQ ID NO: 20; residues 27-38 of SEQ ID NO: 24; residues 27-37 of SEQ ID NO: 28; residues 27-37 of SEQ ID NO: 32; residues 27-32 of SEQ ID NO: 38; and residues 27-38 of SEQ ID NO: 42; the VL CDR2 is selected from the group consisting of residues 55-57 of SEQ ID NO: 4; residues 55-57 of SEQ ID NO: 8; residues 56-58 of SEQ ID NO: 12; residues 56-58 of SEQ ID NO: 16; residues 56-58 of SEQ ID NO: 20; residues 56-58 of SEQ ID NO: 24; residues 55-57 of SEQ ID NO: 28; residues 55-57 of SEQ ID NO: 32; residues 50-52 of SEQ ID NO: 38; and residues 56-58 of SEQ ID NO: 42, and the VL CDR3 is selected from the group consisting of residues 94-102 of SEQ ID NO: 4; residues 94-102 of SEQ ID NO: 8; residues 95-103 of SEQ ID NO: 12; residues 95-103 of SEQ ID NO: 16; residues 95-103 of SEQ ID NO: 20; residues 95-103 of SEQ ID NO: 24; residues 94-102 of SEQ ID NO: 28; residues 94-102 of SEQ ID NO: 32; residues 89-97 of SEQ ID NO: 38; and residues 95-103 of SEQ ID NO: 42.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain having VL CDR1, VL CDR2 and VL CDR3 amino acid sequences, wherein the VL CDR1 is encoded by the nucleic acid sequence selected from the group consisting of residues 79-111 of SEQ ID NO: 3; residues 79-111 of SEQ ID NO: 7; residues 79-114 of SEQ ID NO: 11; residues 79-114 of SEQ ID NO: 15; residues 79-114 of SEQ ID NO: 19; residues 79-114 of SEQ ID NO: 23; residues 79-111 of SEQ ID NO: 27; residues 79-111 of SEQ ID NO: 31; residues 79-96 of SEQ ID NO: 37; and residues 79-114 of SEQ ID NO: 41; the VL CDR2 is encoded by the nucleic acid sequence selected from the group consisting of residues 163-171 of SEQ ID NO: 3; 163-171 of SEQ ID NO: 7; 166-174 of SEQ ID NO: 11; 166-174 of SEQ ID NO: 15; 166-174 of SEQ ID NO: 19; 166-174 of SEQ ID NO: 23; 163-171 of SEQ ID NO: 27; 163-171 of SEQ ID NO: 31; 148-156 of SEQ ID NO: 37; and 166-174 of SEQ ID NO: 41; and the VL CDR3 is encoded by the nucleic acid sequence selected from the group consisting of residues 280-306 of SEQ ID NO: 3; residues 280-306 of SEQ ID NO: 7; residues 283-309 of SEQ ID NO: 11; residues 283-309 of SEQ ID NO: 15; residues 283-309 of SEQ ID NO: 19; residues 283-309 of SEQ ID NO: 23; residues 280-306 of SEQ ID NO: 27; residues 280-306 of SEQ ID NO: 31; residues 265-291 of SEQ ID NO: 37; residues 283-309 of SEQ ID NO: 41.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, wherein the antibody light chain or functional fragment includes a variable light (VL) chain domain having the VL CDR1, VL CDR2 and VL CDR3 amino acid sequence of the clonal isolate 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2.

In some embodiments, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has VL CDR1, VL CDR2, and VL CDR3 amino acid sequences selected from the group consisting of residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 4; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 8; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 12; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 16; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 20; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 24; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 28; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 32; residues 27-32, residues 50-52, and residues 89-97 of SEQ ID NO: 38; and residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 42.

In other embodiments, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has VL CDR1, VL CDR2, and VL CDR3 amino acid sequences are encoded by the nucleic acid sequence selected from the group consisting of residues 79-111, residues 163-171, and residues 280-306 of SEQ ID NO: 3; residues 79-111, residues 163-171, and residues 280-306 of SEQ ID NO: 7; residues 79-114, residues 166-174, and residues 283-309 of SEQ ID NO: 11; residues 79-114, residues 166-174, and residues 283-309 of SEQ ID NO: 15; residues 79-114, residues 166-174, and residues 283-309 of SEQ ID NO: 19; residues 79-114, residues 166-174, and residues 283-309 of SEQ ID NO: 23; residues 79-111, residues 163-171, and residues 280-306 of SEQ ID NO: 27; residues 79-111, residues 163-171, and residues 280-306 of SEQ ID NO: 31; residues 79-96, residues 148-156, and residues 265-291 of SEQ ID NO: 37; residues 79-114, residues 166-174, and residues 283-309 of SEQ ID NO: 41.

In another embodiment, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42.

In yet another embodiment, the present invention provides an isolated polynucleotide encoding an antibody light chain or a functional fragment thereof, the antibody light chain or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain amino acid sequence is encoded by the nucleic acid sequence selected from the group consisting of SEQ ID NO: 3; SEQ ID NO: 7; SEQ ID NO: 11; SEQ ID NO: 15; SEQ ID NO: 19; SEQ ID NO: 23; SEQ ID NO: 27; SEQ ID NO: 31; SEQ ID NO: 37; and SEQ ID NO: 41.

In some embodiments, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2. In some aspects, the antibody or functional fragment thereof has one or more of the CDRs depicted in FIGS. 1-21 or listed in Table 2. An antibody or functional fragment thereof that includes one or more of the CDRs, in particular CDR3, can specifically bind to GD2 as described herein. Specific binding to GD2 can include the specificity and affinity as described in Example I for any of the antibodies provided herein. In some aspects, an antibody or functional fragment thereof of the invention can include the CDC activity and/or ADCC activity of any one of the clonal isolates 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 described herein.

In some embodiments, the present invention provides an isolated antibody or functional fragment thereof, wherein the antibody binds to GD2. Accordingly, in some aspects, the invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain, the domain having VH CDR1, VH CDR2 and VH CDR3 amino acid sequences, wherein the VH CDR1 amino acid sequence is selected from the group consisting of residues 26-33 of SEQ ID NO: 2; residues 26-33 of SEQ ID NO: 6; residues 26-33 of SEQ ID NO: 10; residues 26-33 of SEQ ID NO: 14; residues 26-33 of SEQ ID NO: 18; residues 26-33 of SEQ ID NO: 22; residues 26-33 of SEQ ID NO: 26; residues 26-33 of SEQ ID NO: 30; residues 26-33 of SEQ ID NO: 34; residues 26-33 of SEQ ID NO: 36; and residues 26-33 of SEQ ID NO: 40; the VH CDR2 amino acid sequence is selected from the group consisting of residues 51-58 of SEQ ID NO: 2; residues 51-58 of SEQ ID NO: 6; residues 51-58 of SEQ ID NO: 10; residues 51-58 of SEQ ID NO: 14; residues 51-58 of SEQ ID NO: 18; residues 51-58 of SEQ ID NO: 22; residues 51-58 of SEQ ID NO: 26; residues 51-58 of SEQ ID NO: 30; residues 51-58 of SEQ ID NO: 34; residues 51-58 of SEQ ID NO: 36; and residues 51-58 of SEQ ID NO: 40; and the VH CDR3 amino acid sequence is selected from the group consisting of residues 97-109 of SEQ ID NO: 2; residues 97-109 of SEQ ID NO: 6; residues 97-108 of SEQ ID NO: 10; residues 97-108 of SEQ ID NO: 14; residues 97-108 of SEQ ID NO: 18; residues 97-108 of SEQ ID NO: 22; residues 97-109 of SEQ ID NO: 26; residues 97-109 of SEQ ID NO: 30; residues 97-110 of SEQ ID NO: 34; residues 97-110 of SEQ ID NO: 36; and residues 97-108 of SEQ ID NO: 40.

In some other aspects, the invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain, wherein the VH domain has VH CDR1, VH CDR2, and VH CDR3 amino acid sequences selected from the group consisting of residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 2; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 6; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 10; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 14; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 18; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 22; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 26; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 30; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 34; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 36; and residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 40.

In yet other aspects, the invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain, wherein the VH domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40.

In some embodiments, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has VL CDR1, VL CDR2 and VL CDR3 amino acid sequences, wherein the VL CDR1 is selected from the group consisting of residues 27-37 of SEQ ID NO: 4; residues 27-37 of SEQ ID NO: 8; residues 27-38 of SEQ ID NO: 12; residues 27-38 of SEQ ID NO: 16; residues 27-38 of SEQ ID NO: 20; residues 27-38 of SEQ ID NO: 24; residues 27-37 of SEQ ID NO: 28; residues 27-37 of SEQ ID NO: 32; residues 27-32 of SEQ ID NO: 38; and residues 27-38 of SEQ ID NO: 42; the VL CDR2 is selected from the group consisting of residues 55-57 of SEQ ID NO: 4; residues 55-57 of SEQ ID NO: 8; residues 56-58 of SEQ ID NO: 12; residues 56-58 of SEQ ID NO: 16; residues 56-58 of SEQ ID NO: 20; residues 56-58 of SEQ ID NO: 24; residues 55-57 of SEQ ID NO: 28; residues 55-57 of SEQ ID NO: 32; residues 50-52 of SEQ ID NO: 38; and residues 56-58 of SEQ ID NO: 42, and the VL CDR3 is selected from the group consisting of residues 94-102 of SEQ ID NO: 4; residues 94-102 of SEQ ID NO: 8; residues 95-103 of SEQ ID NO: 12; residues 95-103 of SEQ ID NO: 16; residues 95-103 of SEQ ID NO: 20; residues 95-103 of SEQ ID NO: 24; residues 94-102 of SEQ ID NO: 28; residues 94-102 of SEQ ID NO: 32; residues 89-97 of SEQ ID NO: 38; and residues 95-103 of SEQ ID NO: 42.

In some aspects, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has VL CDR1, VL CDR2, and VL CDR3 amino acid sequences selected from the group consisting of residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 4; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 8; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 12; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 16; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 20; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 24; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 28; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 32; residues 27-32, residues 50-52, and residues 89-97 of SEQ ID NO: 38; and residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 42.

In some other aspects, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable light chain (VL) domain, wherein the VL domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42.

In some embodiments, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain and a variable light chain (VL) domain, wherein the VH domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40; and the VL has an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42.

In some other embodiments, the present invention provides an isolated antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain and a variable light chain (VL) domain, wherein the VH domain and the VL domain respectively include amino acid sequences from the group consisting of SEQ ID NO: 2 and SEQ ID NO: 4; SEQ ID NO: 6 and SEQ ID NO: 8; SEQ ID NO: 10 and SEQ ID NO: 12; SEQ ID NO: 14 and SEQ ID NO: 16; SEQ ID NO: 18 and SEQ ID NO: 20; SEQ ID NO: 22 and SEQ ID NO: 24; SEQ ID NO: 26 and SEQ ID NO: 28; SEQ ID NO: 30 and SEQ ID NO: 32; SEQ ID NO: 34 and SEQ ID NO: 38; SEQ ID NO: 36 and SEQ ID NO: 38; and SEQ ID NO: 40 and SEQ ID NO: 42.

TABLE 2 CDRs of Clonal Isolates Nucleic Acid Residues Amino Acid Sequence Variable (SEQ ID NO:) (SEQ ID NO:) Domain CDR1 CDR2 CDR3 CDR1 CDR2 CDR3 1B7 VH 76-99 151-174 289-327 26-33 51-58 97-109 (NO: 1) (NO: 1) (NO: 1) (NO: 2) (NO: 2) (NO: 2) 1B7 VL 79-111 163-171 280-306 27-37 55-57 94-102 (NO: 3) (NO: 3) (NO: 3) (NO: 4) (NO: 4) (NO: 4) 2H12 VH 76-99 151-174 289-327 26-33 51-58 97-109 (NO: 5) (NO: 5) (NO: 5) (NO: 6) (NO: 6) (NO: 6) 2H12 VL 79-111 163-171 280-306 27-37 55-57 94-102 (NO: 7) (NO: 7) (NO: 7) (NO: 8) (NO: 8) (NO: 8) 1G2 VH 76-99 151-174 289-324 26-33 51-58 97-108 (NO: 9) (NO: 9) (NO: 9) (NO: 10) (NO: 10) (NO: 10) 1G2 VL 79-114 1-174 23-3O9 27 13 565S 95-103 (NO: 11) (NO: 11) (NO: 11) (NO: 12) (NO: 12) (NO: 12) 1E9 VH 76-99 151-174 289-324 26-33 51-58 97-108 (NO: 13) (NO: 13) (NO: 13) (NO: 14) (NO: 14) (NO: 14) 1E9 VL 79-114 166-174 283-309 27-38 56-58 95-103 (NO: 15) (NO: 15) (NO: 15) (NO: 16) (NO: 16) (NO: 16) 1H3 VH 76-99 151-174 289-324 26-33 51-58 97-108 (NO: 17) (NO: 17) (NO: 17) (NO: 18) (NO: 18) (NO: 18) 1H3 VL 79-114 166-174 283-309 27-38 56-58 95-103 (NO: 19) (NO: 19) (NO: 19) (NO: 20) (NO: 20) (NO: 20) 2F5 VH 76-99 151-174 289-324 26-33 51-58 97-108 (NO: 21) (NO: 21) (NO: 21) (NO: 22) (NO: 22) (NO: 22) 2F5 VL 79-114 166-174 283-309 27-38 56-58 95-103 (NO: 23) (NO: 23) (NO: 23) (NO: 24) (NO: 24) (NO: 24) 2F7 VH 76-99 151-174 289-327 26-33 51-58 97-109 (NO: 25) (NO: 25) (NO: 25) (NO: 26) (NO: 26) (NO: 26) 2F7 VL 79-111 163-171 280-306 27-37 55-57 94-102 (NO: 27) (NO: 27) (NO: 27) (NO: 28) (NO: 28) (NO: 28) 2E12 VH 76-99 151-174 289-327 26-33 51-58 97-109 (NO: 29) (NO: 29) (NO: 29) (NO: 30) (NO: 30) (NO: 30) 2E12 VL 79-111 163-171 280-306 27-37 55-57 94-102 (NO: 31) (NO: 31) (NO: 31) (NO: 32) (NO: 32) (NO: 32) 31F9 VH 76-99 151-174 289-330 26-33 51-58 97-110 (NO: 33) (NO: 33) (NO: 33) (NO: 34) (NO: 34) (NO: 34) 31FV2 VH 76-99 151-174 289-330 26-33 51-58 97-110 (NO: 35) (NO: 35) (NO: 35) (NO: 36) (NO: 36) (NO: 36) 31F9 VL 79-96 148-156 265-291 27-32 50-52 89-97 (NO: 37) (NO: 37) (NO: 37) (NO: 38) (NO: 38) (NO: 38) 32E2 VH 76-99 151-174 289-324 26-33 51-58 97-108 (NO: 39) (NO: 39) (NO: 39) (NO: 40) (NO: 40) (NO: 40) 32E2 VL 79-114 166-174 283-309 27-38 56-58 95-103 (NO: 41) (NO: 41) (NO: 41) (NO: 42) (NO: 42) (NO: 42)

In another embodiment, the invention provides a variant of the polynucleotides provided herein. A variant when used in reference to a polynucleotide includes a polynucleotide having one or more modified nucleotides, such as, but not limited to, a methylated nucleotide or a nucleotide analog. Additionally, a variant polynucleotide can include a polynucleotide that is interrupted by non-nucleotide components. Modifications to a polynucleotide can be imparted before or after assembly of the polynucleotide using methods well known to those skilled in the art. For example, a polynucleotide can be modified after polymerization by conjugation with a labeling component using either enzymatic or chemical techniques (e.g., as described in Gottfried and Weinhold, 2011, Biochem. Soc. Trans., 39(2):523-628; Paredes et al., 2011, Methods, 54(2):251-259).

The polynucleotides can be obtained, and the nucleotide sequence of the polynucleotides determined, by any method well known in the art. Since the amino acid sequences of the variable heavy and light chain domains of 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 and 32E2 are known (see, e.g., SEQ ID NOS: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42), nucleotide sequences encoding antibodies and modified versions of these antibodies can be determined using methods well known in the art, i.e., nucleotide codons known to encode particular amino acids are assembled in such a way to generate a nucleic acid that encodes the antibody. Such a polynucleotide encoding the antibody can be assembled from chemically synthesized oligonucleotides (e.g., as described in Kutmeier et al., 1994, BioTechniques 17:242), which, briefly, involves the synthesis of overlapping oligonucleotides containing portions of the sequence encoding the antibody, fragments, or variants thereof, annealing and ligating of those oligonucleotides, and then amplification of the ligated oligonucleotides by PCR.

A polynucleotide encoding an antibody or a functional fragment thereof of the invention can be generated using the nucleic acid sequence of the variable heavy and/or light chain domains of isolates 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 (e.g., SEQ ID NOS: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, and 41). A nucleic acid encoding the antibody or functional fragment can be chemically synthesized or obtained from a suitable source (e.g., cDNA isolated from cells expressing the antibody or functional fragment thereof, such as hybridoma cells selected to express the antibody or functional fragment thereof) by PCR amplification using synthetic primers hybridizable to the 3′ and 5′ ends of the sequence or by cloning using an oligonucleotide probe specific for the particular nucleic acid sequence. Amplified nucleic acids generated by PCR can then be cloned into replicable cloning vectors using any method well known in the art.

In some aspects of the invention, the isolated antibody or functional fragment thereof is a monoclonal antibody. In some aspects of the invention, the isolated antibody or functional fragment thereof provided herein is an IgG or IgM isotype. In a further aspect of the invention, the antibody or function fragment thereof is an antibody of the IgG1 subclass.

In some embodiments, the present invention provides a method of producing an antibody or functional fragment thereof of the invention. The method of the invention can include introducing a polynucleotide of the invention into a host cell, culturing the host cell under conditions and for a sufficient period of time to produce the encoded heavy and/or light chain of an antibody or functional fragment of the invention, and purifying the heavy and/or light chain of an antibody or functional fragment. In other embodiments, the present invention provides a recombinant cell having a polynucleotide encoding an antibody or a functional fragment of the invention. In some aspects, the antibody or function fragment thereof has the variable heavy chain domain and the variable light chain domain of the designated antibodies 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2.

Recombinant expression of an antibody or functional fragment thereof of the invention that binds to a GD2 antigen can include construction of an expression vector containing a polynucleotide that encodes the heavy and/or light chain of an antibody or functional fragment of the invention. Once a polynucleotide encoding an antibody or functional fragment thereof (preferably, but not necessarily, containing the heavy and/or light chain variable domain) of the invention has been obtained, the vector for the production of the antibody or functional fragment can be produced by recombinant DNA technology using techniques well known in the art. Methods for preparing a protein by expressing a polynucleotide containing an antibody or a functional fragment thereof encoding nucleotide sequence are described herein.

Methods which are well known to those skilled in the art can be used to construct expression vectors containing antibody or functional fragments thereof coding sequences and appropriate transcriptional and translational control signals. These methods include, for example, in vitro recombinant DNA techniques, synthetic techniques, and in vivo genetic recombination. The invention, thus, provides replicable vectors including a nucleotide sequence encoding an antibody or functional fragment thereof of the invention operably linked to a promoter. Such vectors can include the nucleotide sequence encoding the constant region of the antibody molecule (see, e.g., International Publication Nos. WO 86/05807 and WO 89/01036; and U.S. Pat. No. 5,122,464) and the variable domain of the antibody can be cloned into such a vector for expression of the entire heavy, the entire light chain, or both the entire heavy and light chains.

The expression vector can be transferred to a host cell by conventional techniques and the transfected cells are then cultured by conventional techniques to produce an antibody or functional fragment thereof of the invention. Thus, the invention includes host cells containing a polynucleotide encoding an antibody or functional fragment thereof of the invention operably linked to a heterologous promoter. In some embodiments for the expression of double-chained antibodies, vectors encoding both the heavy and light chains can be co-expressed in the host cell for expression of the entire immunoglobulin molecule, as detailed below.

A variety of host-expression vector systems can be utilized to express the antibody or functional fragments thereof of the invention (see, e.g., U.S. Pat. No. 5,807,715). Such host-expression systems represent vehicles by which the coding sequences of interest can be produced and subsequently purified, but also represent cells which can, when transformed or transfected with the appropriate nucleotide coding sequences, express an antibody molecule of the invention in situ. These include but are not limited to microorganisms such as bacteria (e.g., E. coli and B. subtilis) transformed with recombinant bacteriophage DNA, plasmid DNA or cosmid DNA expression vectors containing antibody coding sequences; yeast (e.g., Saccharomyces Pichia) transformed with recombinant yeast expression vectors containing antibody coding sequences; insect cell systems infected with recombinant virus expression vectors (e.g., baculovirus) containing antibody coding sequences; plant cell systems infected with recombinant virus expression vectors (e.g., cauliflower mosaic virus, CaMV; tobacco mosaic virus, TMV) or transformed with recombinant plasmid expression vectors (e.g., Ti plasmid) containing antibody coding sequences; or mammalian cell systems (e.g., COS, CHO, BHK, 293, NS0, and 3T3 cells) harboring recombinant expression constructs containing promoters derived from the genome of mammalian cells (e.g., metallothionein promoter) or from mammalian viruses (e.g., the adenovirus late promoter; the vaccinia virus 7.5K promoter). In some aspects, bacterial cells such as Escherichia coli, or eukaryotic cells, especially for the expression of whole recombinant antibody, are used for the expression of a recombinant antibody or functional fragment. For example, mammalian cells such as Chinese hamster ovary cells (CHO), in conjunction with a vector such as the major intermediate early gene promoter element from human cytomegalovirus is an effective expression system for antibodies (Foecking et al., 1986, Gene 45:101; and Cockett et al., 1990, Bio/Technology 8:2). In some embodiments, antibodies or fragments thereof of the invention are produced in CHO cells. In one embodiment, the expression of nucleotide sequences encoding antibodies or functional fragments thereof of the invention which bind to GD2 is regulated by a constitutive promoter, inducible promoter or tissue specific promoter.

In bacterial systems, a number of expression vectors can be advantageously selected depending upon the use intended for the antibody molecule being expressed. For example, when a large quantity of such an antibody is to be produced, for the generation of pharmaceutical compositions of an antibody molecule, vectors which direct the expression of high levels of fusion protein products that are readily purified can be desirable. Such vectors include, but are not limited to, the E. coli expression vector pUR278 (Ruther et al., 1983, EMBO 12:1791), in which the antibody coding sequence can be ligated individually into the vector in frame with the lac Z coding region so that a fusion protein is produced; pIN vectors (Inouye & Inouye, 1985, Nucleic Acids Res. 13:3101-3109; Van Heeke & Schuster, 1989, J. Biol. Chem. 24:5503-5509); and the like. pGEX vectors can also be used to express foreign polypeptides as fusion proteins with glutathione 5-transferase (GST). In general, such fusion proteins are soluble and can easily be purified from lysed cells by adsorption and binding to matrix glutathione agarose beads followed by elution in the presence of free glutathione. The pGEX vectors are designed to include thrombin or factor Xa protease cleavage sites so that the cloned target gene product can be released from the GST moiety.

In an insect system, Autographa californica nuclear polyhedrosis virus (AcNPV) is used as a vector to express foreign genes. The virus grows in Spodoptera frugiperda cells. The antibody or functional fragment coding sequence can be cloned individually into non-essential regions (for example the polyhedrin gene) of the virus and placed under control of an AcNPV promoter (for example the polyhedrin promoter).

In mammalian host cells, a number of viral-based expression systems can be utilized. In cases where an adenovirus is used as an expression vector, the antibody coding sequence of interest can be ligated to an adenovirus transcription/translation control complex, e.g., the late promoter and tripartite leader sequence. This chimeric gene can then be inserted in the adenovirus genome by in vitro or in vivo recombination. Insertion in a non-essential region of the viral genome (e.g., region E1 or E3) will result in a recombinant virus that is viable and capable of expressing the antibody molecule in infected hosts (e.g., see Logan & Shenk, 1984, Proc. Natl. Acad. Sci. USA 8 1:355-359). Specific initiation signals can also be used for efficient translation of inserted antibody coding sequences. These signals include the ATG initiation codon and adjacent sequences. Furthermore, the initiation codon must be in phase with the reading frame of the desired coding sequence to ensure translation of the entire insert. These exogenous translational control signals and initiation codons can be of a variety of origins, both natural and synthetic. The efficiency of expression can be enhanced by the inclusion of appropriate transcription enhancer elements, transcription terminators, etc. (see, e.g., Bittner et al., 1987, Methods in Enzymol. 153:51-544).

In addition, a host cell strain can be chosen which modulates the expression of the inserted sequences, or modifies and processes the gene product in the specific fashion desired. Such modifications (e.g., glycosylation) and processing (e.g., cleavage) of protein products can be important for the function of the antibody or functional fragment. Different host cells have characteristic and specific mechanisms for the post-translational processing and modification of proteins and gene products. Appropriate cell lines or host systems can be chosen to ensure the correct modification and processing of the foreign protein expressed. To this end, eukaryotic host cells which possess the cellular machinery for proper processing of the primary transcript, glycosylation, and phosphorylation of the gene product can be used. Such mammalian host cells include but are not limited to CHO, VERY, BHK, Hela, COS, MDCK, 293, 3T3, W138, BT483, Hs578T, HTB2, BT2O and T47D, NS0 (a murine myeloma cell line that does not endogenously produce any immunoglobulin chains), CRL7O3O and HsS78Bst cells.

For long-term, high-yield production of recombinant proteins, stable expression is preferred. For example, cell lines which stably express the antibody or functional fragment of the invention can be engineered. Rather than using expression vectors which contain viral origins of replication, host cells can be transformed with DNA controlled by appropriate expression control elements (e.g., promoter, enhancer, sequences, transcription terminators, polyadenylation sites, etc.), and a selectable marker. Following the introduction of the foreign DNA, engineered cells can be allowed to grow for 1-2 days in an enriched media, and then are switched to a selective media. The selectable marker in the recombinant plasmid confers resistance to the selection and allows cells to stably integrate the plasmid into their chromosomes and grow to form foci which in turn can be cloned and expanded into cell lines. This method can advantageously be used to engineer cell lines which express the antibody molecule.

A number of selection systems can be used, including but not limited to, the herpes simplex virus thymidine kinase (Wigler et al., 1977, Cell 11:223), hypoxanthineguanine phosphoribosyltransferase (Szybalska & Szybalski, 1992, Proc. Natl. Acad. Sci. USA 48:202), and adenine phosphoribosyltransferase (Lowy et al., 1980, Cell 22:8-17) genes can be employed in tk-, hgprt- or aprt-cells, respectively. Also, antimetabolite resistance can be used as the basis of selection for the following genes: dhfr, which confers resistance to methotrexate (Wigler et al., 1980, Proc. Natl. Acad. Sci. USA. 77(6):3567-70; O'Hare et al., 1981, Proc. Natl. Acad. Sci. USA 78:1527); glutamine synthetase (GS), which is an enzyme responsible for the biosynthesis of glutamine using glutamate and ammonia (Bebbington et al., 1992, Biuotechnology 10:169); gpt, which confers resistance to mycophenolic acid (Mulligan & Berg, 1981, Proc. Natl. Acad. Sci. USA 78:2072); neo, which confers resistance to the aminoglycoside G-418 (Wu and Wu, 1991, Biotherapy 3:87-95; Tolstoshev, 1993, Ann. Rev. Pharmacol. Toxicol. 32:573-596; Mulligan, 1993, Science 260:926-932; and Morgan and Anderson, 1993, Ann. Rev. Biochem. 62:191-217; May, 1993, TIB TECH 11(5):155-215); and hygro, which confers resistance to hygromycin (Santerre et al., 1984, Gene 30:147). Methods well known in the art of recombinant DNA technology can be routinely applied to select the desired recombinant clone, and such methods are described, for example, in Ausubel et al. (eds.), Current Protocols in Molecular Biology, John Wiley & Sons, N Y (1993); Kriegler, Gene Transfer and Expression, A Laboratory Manual, Stockton Press, N Y (1990); and in Chapters 12 and 13, Dracopoli et al. (eds.), Current Protocols in Human Genetics, John Wiley & Sons, N Y (1994); Colberre-Garapin et al., 1981, J. Mol. Biol. 150:1, which are incorporated by reference herein in their entireties.

The expression levels of an antibody molecule can be increased by vector amplification (for a review, see Bebbington and Hentschel, The use of vectors based on gene amplification for the expression of cloned genes in mammalian cells in DNA cloning, Vol. 3 (Academic Press, New York, 1987)). When a marker in the vector system expressing an antibody or functional fragment thereof is amplifiable, increase in the level of inhibitor present in culture of host cell will increase the number of copies of the marker gene. Since the amplified region is associated with the antibody gene, production of the antibody will also increase (Crouse et al., 1983, Mol. Cell. Biol. 3:257).

The host cell can be co-transfected with two expression vectors of the invention, the first vector encoding a heavy chain derived polypeptide and the second vector encoding a light chain derived polypeptide. The two vectors can contain identical selectable markers which enable equal expression of heavy and light chain polypeptides. Alternatively, a single vector can be used which encodes, and is capable of expressing, both heavy and light chain polypeptides. In such situations, the light chain can be placed before the heavy chain to avoid an excess of toxic free heavy chain (Proudfoot, 1986, Nature 322:52; and Kohler, 1980, Proc. Natl. Acad. Sci. USA 77:2197-2199). The coding sequences for the heavy and light chains can include cDNA or genomic DNA.

Additionally, polynucleotides encoding the heavy and/or light chains of the antibody or functional fragment of the invention can be subjected to codon optimization using techniques well known in the art to achieve optimized expression of an antibody or functional fragment of the invention in a desired host cell. For example, in one method of codon optimization, a native codon is substituted by the most frequent codon from a reference set of genes, wherein the rate of codon translation for each amino acid is designed to be high. Additional exemplary methods for generating codon optimized polynucleotides for expression of a desired protein, which can be applied to the heavy and/or light chains of the antibody or functional fragment of the invention, are described in Kanaya et al., Gene, 238:143-155 (1999), Wang et al., Mol. Biol. Evol., 18(5):792-800 (2001), U.S. Pat. No. 5,795,737, U.S. Publication 2008/0076161 and WO 2008/000632.

Once an antibody molecule of the invention has been produced by recombinant expression, it can be purified by any method known in the art for purification of an immunoglobulin molecule, for example, by chromatography (e.g., ion exchange, affinity, particularly by affinity for the specific antigen after Protein A, and sizing column chromatography), centrifugation, differential solubility, or by any other standard technique for the purification of proteins. Further, the antibodies or functional fragments of the present invention can be fused to heterologous polypeptide sequences provided herein or otherwise known in the art to facilitate purification. For example, an antibody or functional fragment of the invention can be purified through recombinantly adding a poly-histidine tag (His-tag), FLAG-tag, hemagglutinin tag (HA-tag) or myc-tag among others that are commercially available and utilizing purification methods well known to those skilled in the art.

In some embodiments, the antibody functional fragment of the invention can be, but is not limited to, a Fab, a Fab′, a F(ab′)2, a Fabc, a scFV, a diabody, a triabody, minibody or a single-domain antibody (sdAB). With respect to antibodies and functional fragments thereof, various forms, alterations and modifications are well known in the art. The GD2 specific antibody fragments of the invention can include any of such various antibody forms, alterations and modifications. Examples of such various forms and terms as they are known in the art are set forth below.

A Fab fragment refers to a monovalent fragment consisting of the VL, VH, CL and CH1 domains; a F(ab′)₂ fragment is a bivalent fragment including two Fab fragments linked by a disulfide bridge at the hinge region; a Fd fragment consists of the VH and CH1 domains; an Fv fragment consists of the VL and VH domains of a single arm of an antibody; and a dAb fragment (Ward et al., Nature 341:544-546, (1989)) consists of a VH domain.

An antibody can have one or more binding sites. If there is more than one binding site, the binding sites can be identical to one another or can be different. For example, a naturally occurring immunoglobulin has two identical binding sites, a single-chain antibody or Fab fragment has one binding site, while a “bispecific” or “bifunctional” antibody has two different binding sites.

A single-chain antibody (scFv) refers to an antibody in which a VL and a VH region are joined via a linker (e.g., a synthetic sequence of amino acid residues) to form a continuous polypeptide chain wherein the linker is long enough to allow the protein chain to fold back on itself and form a monovalent antigen binding site (see, e.g., Bird et al., Science 242:423-26 (1988) and Huston et al., Proc. Natl. Acad. Sci. USA 85:5879-83 (1988)). Diabodies refer to bivalent antibodies including two polypeptide chains, wherein each polypeptide chain includes VH and VL domains joined by a linker that is too short to allow for pairing between two domains on the same chain, thus allowing each domain to pair with a complementary domain on another polypeptide chain (see, e.g., Holliger et al., Proc. Natl. Acad. Sci. USA 90:6444-48 (1993), and Poljak et al., Structure 2:1121-23 (1994)). If the two polypeptide chains of a diabody are identical, then a diabody resulting from their pairing will have two identical antigen binding sites. Polypeptide chains having different sequences can be used to make a diabody with two different antigen binding sites. Similarly, tribodies and tetrabodies are antibodies including three and four polypeptide chains, respectively, and forming three and four antigen binding sites, respectively, which can be the same or different.

The present invention also provides an antibody or functional fragment thereof derivative of 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 and 32E2, wherein the antibody or functional fragment binds to GD2. Standard techniques well known to those of skill in the art can be used to introduce mutations in the nucleotide sequence encoding an antibody or functional fragment thereof of the invention, including, for example, site-directed mutagenesis and PCR-mediated mutagenesis which results in amino acid substitutions. In some aspects, the derivative includes less than 25 amino acid substitutions, less than 20 amino acid substitutions, less than 15 amino acid substitutions, less than 10 amino acid substitutions, less than 5 amino acid substitutions, less than 4 amino acid substitutions, less than 3 amino acid substitutions, or less than 2 amino acid substitutions relative to the original molecule.

In some embodiments, the invention provides an antibody or functional fragment thereof having modified forms of naturally occurring amino acids, conservative substitutions, non-naturally occurring amino acids, amino acid analogues and mimetics so long as such the antibody or functional fragment retains functional activity as defined herein. In one embodiment, the derivative has conservative amino acid substitutions that are made at one or more predicted non-essential amino acid residues. A conservative amino acid substitution is one in which the amino acid residue is replaced with an amino acid residue having a side chain with a similar charge. Families of amino acid residues having side chains with similar charges have been defined in the art. These families include amino acids with basic side chains (e.g., lysine, arginine, histidine), acidic side chains (e.g., aspartic acid, glutamic acid), uncharged polar side chains (e.g., glycine, asparagine, glutamine, serine, threonine, tyrosine, cysteine), nonpolar side chains (e.g., alanine, valine, leucine, isoleucine, proline, phenylalanine, methionine, tryptophan), beta-branched side chains (e.g., threonine, valine, isoleucine) and aromatic side chains (e.g., tyrosine, phenylalanine, tryptophan, histidine). Alternatively, mutations can be introduced randomly along all or part of the coding sequence, such as by saturation mutagenesis, and the resultant mutants can be screened for biological activity to identify mutants that retain activity. Following mutagenesis, the encoded antibody or functional fragment thereof can be expressed and the activity of the antibody or functional fragment can be determined.

In some embodiments, the invention provides an antibody or functional fragment thereof having modified fucosylation, galactosylation and/or sialylation of an Fc fragment contained within an antibody or functional fragment of the invention. Such modifications of an Fc fragment can effect Fc receptor-mediated activity as discussed in Peipp et al., Blood, 112(6):2390-2399 (2008). For example, glycoengineered therapeutic antibodies lacking core fucose residues from the Fc N-glycans exhibit strong ADCC at lower concentrations with much higher efficacy compared to fucosylated counterparts. Shields et al., J. Biol. Chem., 277(30):26733-40 (2002); Okazaki et al., J Mol Biol., 336:1239-1249 (2004); Natsume et al., J. Immunol. Methods., 306:93-103 (2005). Methods for modifying the fucosylation, galactosylation and/or sialylation of an antibody for functional fragment thereof are well known in the art. For example, defucosylation approaches can be grouped into three methodologies (1) conversion of the N-glycosylation pathway of nonmammalian cells to the ‘humanized’ non-fucosylation pathway; (2) inactivation of the N-glycan fucosylation pathway of mammalian cells and (3) in vitro chemical synthesis of non-fucosylated N-glycoprotein or enzymatic modification of N-glycans to non-fucosylated forms, as described in Yamane-Ohnuki et al., MAbs., 1(3):230-236 (2009). It is understood that any one of these methods or any other method that is well known in the art can be used to produce an antibody or functional fragment thereof having modified fucosylation, galactosylation and/or sialylation.

Antibodies or functional fragments thereof of the invention that bind to GD2 can be produced by any method known in the art for the synthesis of antibodies, in particular, by chemical synthesis or by recombinant expression techniques. The practice of the invention employs, unless otherwise indicated, conventional techniques in molecular biology, microbiology, genetic analysis, recombinant DNA, organic chemistry, biochemistry, PCR, oligonucleotide synthesis and modification, nucleic acid hybridization, and related fields within the skill of the art. These techniques are described in the references cited herein and are fully explained in the literature. See, e.g., Maniatis et al. (1982) Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press; Sambrook et al. (1989), Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor Laboratory Press; Sambrook et al. (2001) Molecular Cloning: A Laboratory Manual, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y.; Ausubel et al., Current Protocols in Molecular Biology, John Wiley & Sons (1987 and annual updates); Current Protocols in Immunology, John Wiley & Sons (1987 and annual updates) Gait (ed.) (1984) Oligonucleotide Synthesis: A Practical Approach, IRL Press; Eckstein (ed.) (1991) Oligonucleotides and Analogues: A Practical Approach, IRL Press; Birren et al. (eds.) (1999) Genome Analysis: A Laboratory Manual, Cold Spring Harbor Laboratory Press; Borrebaeck (ed.) (1995) Antibody Engineering, Second Edition, Oxford University Press; Lo (ed.) (2006) Antibody Engineering: Methods and Protocols (Methods in Molecular Biology); Vol. 248, Humana Press, Inc; each of which is incorporated herein by reference in its entirety.

Monoclonal antibodies can be prepared using a wide variety of techniques known in the art including the use of hybridoma and recombinant technologies, or a combination thereof. For example, monoclonal antibodies can be produced using hybridoma techniques including those known in the art and taught, for example, in Harlow et al., Antibodies: A Laboratory Manual, (Cold Spring Harbor Laboratory Press, 2nd ed. 1988); Hammerling et al., in: Monoclonal Antibodies and T-Cell Hybridomas 563 681 (Elsevier, N.Y., 1981), each of which is incorporated herein by reference in its entirety. A monoclonal antibody is not limited to antibodies produced through hybridoma technology. Other exemplary methods of producing monoclonal antibodies are known in the art. Additional exemplary methods of producing monoclonal antibodies are provided in Example I herein.

Antibody functional fragments which bind GD2 can be generated by any technique well known to those of skill in the art. For example, Fab and F(ab′)₂ fragments of the invention can be produced by proteolytic cleavage of immunoglobulin molecules, using enzymes such as papain (to produce Fab fragments) or pepsin (to produce F(ab′)₂ fragments). F(ab′)₂ fragments contain the variable region, the light chain constant region and the CH1 domain of the heavy chain.

The antibody functional fragments of the invention can also be generated using various phage display methods known in the art. For example, in phage display methods, functional antibody domains, such as the heavy and/or light chain variable regions having one, two, three, four, five or six CDRs provided herein, are displayed on the surface of phage particles which carry the polynucleotide sequences encoding them. The DNA encoding the VH and VL domains are recombined together with an scFv linker by PCR and cloned into a phagemid vector. The vector is electroporated in E. coli and the E. coli is infected with helper phage. Phage used in these methods are typically filamentous phage including fd and M13 and the VH and VL domains are usually recombinantly fused to either the phage gene III or gene VIII. Phage expressing an antigen binding domain that binds to a particular antigen, such as GD2, can be selected or identified with antigen, e.g., using labeled antigen or antigen bound or captured to a solid surface or bead. Examples of phage display methods that can be used to make the antibody functional fragments of the present invention include those disclosed in Brinkman et al., 1995, J. Immunol. Methods 182:41-50; Ames et al., 1995, J. Immunol. Methods 184:177-186; Kettleborough et al., 1994, Eur. J. Immunol. 24:952-958; Persic et al., 1997, Gene 187:9-18; Burton et al., 1994, Advances in Immunology 57:191-280; PCT Application No. PCT/GB91/01134; International Publication Nos. WO 90/02809, WO 91/10737, WO 92/01047, WO 92/18619, WO 93/11236, WO 95/15982, WO 95/20401, and WO97/13844; and U.S. Pat. Nos. 5,698,426, 5,223,409, 5,403,484, 5,580,717, 5,427,908, 5,750,753, 5,821,047, 5,571,698, 5,427,908, 5,516,637, 5,780,225, 5,658,727, 5,733,743 and 5,969,108; each of which is incorporated herein by reference in its entirety.

As described in the above references, after phage selection, the antibody coding regions from the phage can be isolated and used to generate whole antibodies, including human antibodies, or any other desired antigen binding fragment, and expressed in any desired host, including mammalian cells, insect cells, plant cells, yeast, and bacteria, e.g., as described herein.

Techniques to recombinantly produce Fab, Fab′ and F(ab′)2 fragments can also be employed using methods known in the art such as those disclosed in PCT publication No. WO 92/22324; Mullinax et al., 1992, BioTechniques 12(6):864-869; Sawai et al., 1995, AJRI 34:26-34; and Better et al., 1988, Science 240:1041-1043, each of which is incorporated by reference in its entirety.

To generate whole antibodies, PCR primers including VH or VL nucleotide sequences, a restriction site, and a flanking sequence to protect the restriction site can be used to amplify the VH or VL sequences in scFv clones. Utilizing cloning techniques well known to those of skill in the art, the PCR amplified VH domains can be cloned into vectors expressing a VH constant region, e.g., the human gamma 1 constant region, and the PCR amplified VL domains can be cloned into vectors expressing a VL constant region, e.g., human kappa or lambda constant regions. The VH and VL domains can also be cloned into one vector expressing the necessary constant regions. The heavy chain conversion vectors and light chain conversion vectors are then co-transfected into cell lines to generate stable or transient cell lines that express full-length antibodies, e.g., IgG, using techniques well known to those of skill in the art.

In some embodiments, an antibody or functional fragment of the invention is conjugated (covalent or non-covalent conjugations) or recombinantly fused to one or more diagnostic agent, detectable agent or therapeutic agent or any other desired molecule. The conjugated or recombinantly fused antibody or functional fragment can be useful for monitoring or diagnosing the onset, development, progression and/or severity of a disease associated with the expression of GD2, such as cancer or tumor formation, as part of a clinical testing procedure, such as determining the efficacy of a particular therapy.

In some aspects, an antibody or functional fragment thereof of the invention is conjucated with a detectable agent. Detection and diagnosis can be accomplished, for example, by coupling the antibody or functional fragment of the invention to detectable substances including, but not limited to, radioactive materials, such as, but not limited to, zirconium (⁸⁹Zr), iodine (¹³¹I, ¹²⁵I, ¹²⁴I, ¹²³I, and ¹²¹I) carbon (¹⁴C, ¹¹C), sulfur (³⁵S), tritium (³H), indium (¹¹⁵In, ¹¹³In, ¹¹²In, and ¹¹¹In,), technetium (⁹⁹Tc), thallium (²⁰¹Ti), gallium (⁶⁸Ga, ⁶⁷Ga), palladium (¹⁰³Pd), molybdenum (⁹⁹Mo), xenon (¹³³Xe), fluorine (¹⁸F), ¹⁵O, ¹³N, ⁶⁴Cu, ^(94m)Tc, ¹⁵³Sm, ¹⁷⁷Lu, ¹⁵⁹Gd, ¹⁴⁹Pm, ¹⁴⁰La, ¹⁷⁵Yb, ¹⁶⁶Ho, ⁸⁶Y, ⁹⁰Y, ⁴⁷Sc, ¹⁸⁶Re, ¹⁸⁸Re, ¹⁴²Pr, ¹⁰⁵Rh, ⁹⁷Ru, ⁶⁸Ge, ⁵⁷Co, ⁶⁵Zn, ⁸⁵Sr, ³²P, ¹⁵³Gd, ¹⁶⁹Yb, ⁵¹Cr, ⁵⁴Mn, ⁷⁵Se, ¹¹³Sn, and ¹¹⁷Sn; and positron emitting metals using various positron emission tomographies, various enzymes, such as, but not limited to, horseradish peroxidase, alkaline phosphatase, beta-galactosidase, or acetylcholinesterase; prosthetic groups, such as, but not limited to, streptavidin/biotin and avidin/biotin; fluorescent materials, such as, but not limited to, umbelliferone, fluorescein, fluorescein isothiocynate, rhodamine, dichlorotriazinylamine fluorescein, dansyl chloride or phycoerythrin; luminescent materials, such as, but not limited to, luminol; bioluminescent materials, such as but not limited to, luciferase, luciferin, and aequorin, and non-radioactive paramagnetic metal ions.

The present invention further encompasses therapeutic uses of an antibody or functional fragment of the invention conjugated (covalent or non-covalent conjugations) or recombinantly fused to one or more therapeutic agent. In this context, for example, the antibody can be conjugated or recombinantly fused to a therapeutic agent, such as a cytotoxin, e.g., a cytostatic or cytocidal agent, or a radioactive metal ion, e.g., alpha-emitters. A cytotoxin or cytotoxic agent includes any agent that is detrimental to cells. A therapeutic agent can be a chemotherapeutic such as, but is not limited to, an anthracycline (e.g., doxorubicin and daunorubicin (formerly daunomycin)); a taxan (e.g., paclitaxel (Taxol) and docetaxel (Taxotere); an antimetabolite (e.g., methotrexate, 6-mercaptopurine, 6-thioguanine, cytarabine, 5-fluorouracil and decarbazine); or an alkylating agent (e.g., mechlorethamine, thioepa chlorambucil, melphalan, carmustine (BCNU), lomustine (CCNU), cyclothosphamide, busulfan, dibromomannitol, streptozotocin, mitomycin C, cisdichlorodiamine platinum (II) (DDP) and cisplatin); an antibiotic (e.g., actinomycin D, bleomycin, mithramycin, and anthramycin (AMC)); an Auristatin molecule (e.g., auristatin PHE, bryostatin 1, solastatin 10, monomethyl auristatin E (MMAE) and monomethylauristatin F (MMAF)); a hormone (e.g., glucocorticoids, progestins, androgens, and estrogens); a nucleoside analoge (e.g. Gemcitabine), a DNA-repair enzyme inhibitor (e.g., etoposide and topotecan), a kinase inhibitor (e.g., compound ST1571, also known as Gleevec or imatinib mesylate); a cytotoxic agent (e.g., maytansine, paclitaxel, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, 1-dehydrotestosterone, glucorticoids, procaine, tetracaine, lidocaine, propranolol, puromycin and analogs or homologs thereof, and those compounds disclosed in U.S. Pat. Nos. 6,245,759, 6,399,633, 6,383,790, 6,335,156, 6,271,242, 6,242,196, 6,218,410, 6,218,372, 6,057,300, 6,034,053, 5,985,877, 5,958,769, 5,925,376, 5,922,844, 5,911,995, 5,872,223, 5,863,904, 5,840,745, 5,728,868, 5,648,239, 5,587,459); a farnesyl transferase inhibitor (e.g., R115777, BMS-214662, and those disclosed by, for example, U.S. Pat. Nos. 6,458,935, 6,451,812, 6,440,974, 6,436,960, 6,432,959, 6,420,387, 6,414,145, 6,410,541, 6,410,539, 6,403,581, 6,399,615, 6,387,905, 6,372,747, 6,369,034, 6,362,188, 6,342,765, 6,342,487, 6,300,501, 6,268,363, 6,265,422, 6,248,756, 6,239,140, 6,232,338, 6,228,865, 6,228,856, 6,225,322, 6,218,406, 6,211,193, 6,187,786, 6,169,096, 6,159,984, 6,143,766, 6,133,303, 6,127,366, 6,124,465, 6,124,295, 6,103,723, 6,093,737, 6,090,948, 6,080,870, 6,077,853, 6,071,935, 6,066,738, 6,063,930, 6,054,466, 6,051,582, 6,051,574, and 6,040,305); a topoisomerase inhibitor (e.g., camptothecin, irinotecan, SN-38, topotecan, 9-aminocamptothecin, GG-211 (GI 147211), DX-8951f, IST-622, rubitecan, pyrazoloacridine, XR-5000, saintopin, UCE6, UCE1022, TAN-1518A, TAN 1518B, KT6006, KT6528, ED-110, NB-506, ED-110, NB-506, fagaronine, coralyne, beta-lapachone and rebeccamycin); a DNA minor groove binder (e.g., Hoescht dye 33342 and Hoechst dye 33258); adenosine deaminase inhibitors (e.g., Fludarabine phosphate and 2-Chlorodeoxyadenosine); or pharmaceutically acceptable salts, solvates, clathrates, or prodrugs thereof. A therapeutic agent can be a immunotherapeutic such as, but is not limited to, cetuximab, bevacizumab, heceptin, rituximab).

In addition, an antibody or functional fragment of the invention can be conjugated to a therapeutic agent such as a radioactive metal ion, such as alpha-emitters such as ²¹³Bi or macrocyclic chelators useful for conjugating radiometal ions, including but not limited to, ¹³¹In, ¹³¹LU, ¹³¹Y, ¹³¹Ho, ¹³¹Sm; or a macrocyclic chelator, such as 1,4,7,10-tetraazacyclododecane-N,N′,N″,N′″-tetraacetic acid (DOTA) which can be attached to the antibody or functional fragment via a linker molecule. Such linker molecules are commonly known in the art and described in Denardo et al., 1998, Clin Cancer Res. 4(10):2483-90; Peterson et al., 1999, Bioconjug. Chem. 10(4):553-7; and Zimmerman et al., 1999, Nucl. Med. Biol. 26(8):943-50.

Further, an antibody or functional fragment of the invention can be conjugated (covalent or non-covalent conjugations) or recombinantly fused to a therapeutic agent that modifies a given biological response. Thus, therapeutic agents are not to be construed as limited to classical chemical therapeutic agents. For example, the therapeutic agent can be a protein, peptide, or polypeptide possessing a desired biological activity. Such proteins can include, for example, a toxin (e.g., abrin, ricin A, pseudomonas exotoxin, cholera toxin and diphtheria toxin); a protein such as tumor necrosis factor, γ-interferon, α-interferon, nerve growth factor, platelet derived growth factor, tissue plasminogen activator, an apoptotic agent (e.g., TNF-γ, AIM I, AIM II, Fas Ligand and VEGF), an anti-angiogenic agent (e.g., angiostatin, endostatin and a component of the coagulation pathway such as tissue factor); a biological response modifier (e.g., a cytokine such as interferon gamma, interleukin-1, interleukin-2, interleukin-5, interleukin-6, interleukin-7, interleukin-9, interleukin-10, interleukin-12, interleukin-15, interleukin-23, granulocyte macrophage colony stimulating factor, and granulocyte colony stimulating factor); a growth factor (e.g., growth hormone), or a coagulation agent (e.g., calcium, vitamin K, tissue factors, such as but not limited to, Hageman factor (factor XII), high-molecular-weight kininogen (HMWK), prekallikrein (PK), coagulation proteins-factors II (prothrombin), factor V, XIIa, VIII, XIIIa, XI, XIa, IX, IXa, X, phospholipid, and fibrin monomer).

The present invention encompasses antibodies or functional fragments of the invention recombinantly fused or chemically conjugated (covalent or non-covalent conjugations) to a heterologous protein or polypeptide to generate fusion proteins. In some aspects, such a polypeptide can be about 10, about 20, about 30, about 40, about 50, about 60, about 70, about 80, about 90 or about 100 amino acids in length. In some aspects, the invention provides fusion proteins having a functional fragment of an antibody of the invention (e.g., a Fab fragment, Fd fragment, Fv fragment, F(ab)₂ fragment, a VH domain, a VH CDR, a VL domain or a VL CDR) and a heterologous protein or polypeptide. In one embodiment, the heterologous protein or polypeptide that the antibody or functional fragment is fused to is useful for targeting the antibody or functional fragment to a particular cell type, such as a cell that expresses GD2.

A conjugated or fusion protein of the invention includes any antibody or functional fragment of the invention provided herein conjugated (covalent or non-covalent conjugations) or recombinantly fused to a diagnostic agent, detectable agent or therapeutic agent. In one embodiment, a conjugated or fusion protein of the invention includes a 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 antibody, and a diagnostic agent, detectable agent or therapeutic agent. In another embodiment, a conjugated or fusion protein of the invention includes a functional fragment of 1B7, 2H12, 1G2, 1E9, 1H3, 2F5, 2F7, 2E12, 31F9, 31F9V2 or 32E2 antibodies, and a diagnostic agent, detectable agent or therapeutic agent.

In some embodiments, a conjugated or fusion protein of the present invention includes one or more VH CDRs having the amino acid sequence of any one of the VH CDRs depicted in SEQ ID NOS: 2, 6, 10, 14, 18, 22, 26, 30, 34, 36, or 40 and a diagnostic agent, detectable agent or therapeutic agent. In another embodiment, a conjugated or fusion protein includes one or more VL CDRs having the amino acid sequence of any one of the VL CDRs depicted in SEQ ID NOS: 4, 8, 12, 16, 20, 24, 28, 32, 38, or 42 and a diagnostic agent, detectable agent or therapeutic agent.

In some aspects, a conjugated or fusion protein of the invention includes a VH domain, the VH domain having VH CDR1, VH CDR2 and VH CDR3 amino acid sequences, wherein the VH CDR1 amino acid sequence is selected from the group consisting of residues 26-33 of SEQ ID NO: 2; residues 26-33 of SEQ ID NO: 6; residues 26-33 of SEQ ID NO: 10; residues 26-33 of SEQ ID NO: 14; residues 26-33 of SEQ ID NO: 18; residues 26-33 of SEQ ID NO: 22; residues 26-33 of SEQ ID NO: 26; residues 26-33 of SEQ ID NO: 30; residues 26-33 of SEQ ID NO: 34; residues 26-33 of SEQ ID NO: 36; and residues 26-33 of SEQ ID NO: 40; the VH CDR2 amino acid sequence is selected from the group consisting of residues 51-58 of SEQ ID NO: 2; residues 51-58 of SEQ ID NO: 6; residues 51-58 of SEQ ID NO: 10; residues 51-58 of SEQ ID NO: 14; residues 51-58 of SEQ ID NO: 18; residues 51-58 of SEQ ID NO: 22; residues 51-58 of SEQ ID NO: 26; residues 51-58 of SEQ ID NO: 30; residues 51-58 of SEQ ID NO: 34; residues 51-58 of SEQ ID NO: 36; and residues 51-58 of SEQ ID NO: 40; and the VH CDR3 amino acid sequence is selected from the group consisting of residues 97-109 of SEQ ID NO: 2; residues 97-109 of SEQ ID NO: 6; residues 97-108 of SEQ ID NO: 10; residues 97-108 of SEQ ID NO: 14; residues 97-108 of SEQ ID NO: 18; residues 97-108 of SEQ ID NO: 22; residues 97-109 of SEQ ID NO: 26; residues 97-109 of SEQ ID NO: 30; residues 97-110 of SEQ ID NO: 34; residues 97-110 of SEQ ID NO: 36; and residues 97-108 of SEQ ID NO: 40, and a diagnostic agent, detectable agent or therapeutic agent.

In some other aspects, a conjugated or fusion protein of the invention includes a VH domain, the VH domain having VH CDR1, VH CDR2, and VH CDR3 amino acid sequences selected from the group consisting of residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 2; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 6; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 10; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 14; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 18; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 22; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 26; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 30; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 34; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 36; and residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 40, and a diagnostic agent, detectable agent or therapeutic agent.

In yet other aspects, a conjugated or fusion protein of the invention includes a VH domain, the VH domain having an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40, and a diagnostic agent, detectable agent or therapeutic agent.

In some embodiments, a conjugated or fusion protein of the invention includes a VL domain, the VL domain having VL CDR1, VL CDR2 and VL CDR3 amino acid sequences, wherein the VL CDR1 is selected from the group consisting of residues 27-37 of SEQ ID NO: 4; residues 27-37 of SEQ ID NO: 8; residues 27-38 of SEQ ID NO: 12; residues 27-38 of SEQ ID NO: 16; residues 27-38 of SEQ ID NO: 20; residues 27-38 of SEQ ID NO: 24; residues 27-37 of SEQ ID NO: 28; residues 27-37 of SEQ ID NO: 32; residues 27-32 of SEQ ID NO: 38; and residues 27-38 of SEQ ID NO: 42; the VL CDR2 is selected from the group consisting of residues 55-57 of SEQ ID NO: 4; residues 55-57 of SEQ ID NO: 8; residues 56-58 of SEQ ID NO: 12; residues 56-58 of SEQ ID NO: 16; residues 56-58 of SEQ ID NO: 20; residues 56-58 of SEQ ID NO: 24; residues 55-57 of SEQ ID NO: 28; residues 55-57 of SEQ ID NO: 32; residues 50-52 of SEQ ID NO: 38; and residues 56-58 of SEQ ID NO: 42, and the VL CDR3 is selected from the group consisting of residues 94-102 of SEQ ID NO: 4; residues 94-102 of SEQ ID NO: 8; residues 95-103 of SEQ ID NO: 12; residues 95-103 of SEQ ID NO: 16; residues 95-103 of SEQ ID NO: 20; residues 95-103 of SEQ ID NO: 24; residues 94-102 of SEQ ID NO: 28; residues 94-102 of SEQ ID NO: 32; residues 89-97 of SEQ ID NO: 38; and residues 95-103 of SEQ ID NO: 42, and a diagnostic agent, detectable agent or therapeutic agent.

In other embodiments, a conjugated or fusion protein of the invention includes a VL domain, the VL domain having VL CDR1, VL CDR2, and VL CDR3 amino acid sequences selected from the group consisting of residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 4; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 8; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 12; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 16; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 20; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 24; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 28; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 32; residues 27-32, residues 50-52, and residues 89-97 of SEQ ID NO: 38; and residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 42, and a diagnostic agent, detectable agent or therapeutic agent.

In some other aspects, a conjugated or fusion protein of the invention includes a VL domain, the VL domain an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42, and a diagnostic agent, detectable agent or therapeutic agent.

In some embodiments, a conjugated or fusion protein of the invention includes a VH domain and a VL domain, wherein the VH domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40; and the VL domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42, and a diagnostic agent, detectable agent or therapeutic agent.

In some other embodiments, a conjugated or fusion protein of the invention includes a VH domain and a VL domain, wherein the VH domain and the VL domain respectively have an amino acid sequence from the group consisting of SEQ ID NO: 2 and SEQ ID NO: 4; SEQ ID NO: 6 and SEQ ID NO: 8; SEQ ID NO: 10 and SEQ ID NO: 12; SEQ ID NO: 14 and SEQ ID NO: 16; SEQ ID NO: 18 and SEQ ID NO: 20; SEQ ID NO: 22 and SEQ ID NO: 24; SEQ ID NO: 26 and SEQ ID NO: 28; SEQ ID NO: 30 and SEQ ID NO: 32; SEQ ID NO: 34 and SEQ ID NO: 38; SEQ ID NO: 36 and SEQ ID NO: 38; and SEQ ID NO: 40 and SEQ ID NO: 42, and a diagnostic agent, detectable agent or therapeutic agent.

Methods for fusing or conjugating diagnostic agents, detectable agents or therapeutic agents (including polypeptides) to antibodies are well known, see, e.g., Arnon et al., “Monoclonal Antibodies For Immunotargeting Of Drugs In Cancer Therapy”, in Monoclonal Antibodies And Cancer Therapy, Reisfeld et al. (eds.), pp. 243-56 (Alan R. Liss, Inc. 1985); Hellstrom et al., “Antibodies For Drug Delivery”, in Controlled Drug Delivery (2nd Ed.), Robinson et al. (eds.), pp. 623-53 (Marcel Dekker, Inc. 1987); Thorpe, “Antibody Carriers Of Cytotoxic Agents In Cancer Therapy: A Review”, in Monoclonal Antibodies 84: Biological And Clinical Applications, Pinchera et al. (eds.), pp. 475-506 (1985); “Analysis, Results, And Future Prospective Of The Therapeutic Use Of Radiolabeled Antibody In Cancer Therapy”, in Monoclonal Antibodies For Cancer Detection And Therapy, Baldwin et al. (eds.), pp. 303-16 (Academic Press 1985), Thorpe et al., 1982, Immunol. Rev. 62:119-58; U.S. Pat. Nos. 5,336,603, 5,622,929, 5,359,046, 5,349,053, 5,447,851, 5,723,125, 5,783,181, 5,908,626, 5,844,095, 5,112,946, 7,981,695, 8,039,273, 8,142,784; U.S. Publications 2009/0202536, 2010/0034837, 2011/0137017, 2011/0280891, 2012/0003247; EP 307,434; EP 367,166; EP 394,827; PCT publications WO 91/06570, WO 96/04388, WO 96/22024, WO 97/34631, and WO 99/04813; Ashkenazi et al., Proc. Natl. Acad. Sci. USA, 88: 10535-10539, 1991; Traunecker et al., Nature, 331:84-86, 1988; Zheng et al., J. Immunol., 154:5590-5600, 1995; Vil et al., Proc. Natl. Acad. Sci. USA, 89:11337-11341, 1992; and Senter, Current Opinion in Chemical Biology, 13:235-244 (2009), which are incorporated herein by reference in their entireties.

In another aspect, a diagnostic agent, detectable agent or therapeutic agent can be attached at the hinge region of a reduced antibody component via disulfide bond formation. Alternatively, such agents can be attached to the antibody component using a heterobifunctional cross-linker, such as N-succinyl 3-(2-pyridyldithio)proprionate (SPDP). Yu et al., Int. J. Cancer 56: 244 (1994). General techniques for such conjugation are well known in the art. See, for example, Wong, CHEMISTRY OF PROTEIN CONJUGATION AND CROSS-LINKING (CRC Press 1991); Upeslacis et al., “Modification of Antibodies by Chemical Methods,” in MONOCLONAL ANTIBODIES: PRINCIPLES AND APPLICATIONS, Birch et al. (eds.), pages 187-230 (Wiley-Liss, Inc. 1995); Price, “Production and Characterization of Synthetic Peptide-Derived Antibodies,” in MONOCLONAL ANTIBODIES: PRODUCTION, ENGINEERING AND CLINICAL APPLICATION, Ritter et al. (eds.), pages 60-84 (Cambridge University Press 1995).

Alternatively, a diagnostic agent, detectable agent or therapeutic agent can be conjugated via a carbohydrate moiety in the Fc region of the antibody. Methods for conjugating peptides to antibody components via an antibody carbohydrate moiety are well known to those of skill in the art. See, for example, Shih et al., Int. J. Cancer. 41:832-839 (1988); Shih et al., Int. J. Cancer. 46:1101-1106 (1990); and Shih et al., U.S. Pat. No. 5,057,313, all of which are incorporated in their entirety by reference. The general method involves reacting an antibody component having an oxidized carbohydrate portion with a carrier polymer that has at least one free amine function and that is loaded with a plurality of peptide. This reaction results in an initial Schiff base (imine) linkage, which can be stabilized by reduction to a secondary amine to form the final conjugate.

However, if the Fc region is absent, for example, if an antibody functional fragment as provided herein is desirable, it is still possible to attach a diagnostic agent, a detectable agent or a therapeutic agent. A carbohydrate moiety can be introduced into the light chain variable region of a full-length antibody or antibody fragment. See, for example, Leung et al., J. Immunol., 154: 5919 (1995); U.S. Pat. Nos. 5,443,953 and 6,254,868, all of which are incorporated in their entirety by reference. The engineered carbohydrate moiety is used to attach the diagnostic agent, detectable agent or therapeutic agent.

The therapeutic agent conjugated or recombinantly fused to an antibody or functional fragment of the invention that binds to GD2 can be chosen to achieve the desired prophylactic or therapeutic effect(s). It is understood that it is within the skill level of a clinician or other medical personnel to consider the following when deciding which therapeutic agent to conjugate or recombinantly fuse to an antibody or functional fragment of the invention: the nature of the disease, the severity of the disease, and the condition of the subject.

A conjugate or fusion antibody or functional fragment of the invention that is detectably labeled as provided herein and binds to GD2 can be used for diagnostic purposes to detect, diagnose, or monitor a disease, wherein the cells that cause or are associated with the disease express GD2. For example, as provided herein, cancer cells and tumors have been shown to express GD2, such as, but not limited to, neuroblastoma, osteosarcomas and other subsets of sarcomas, melanomas, gliomas, small cell lung cancer, breast cancer and breast cancer stem cells, medulloblastoma, and astrocytoma. Other types of sarcomas include, but are not limited be soft tissue sarcoma, chondrosarcoma, liposarcoma, and leiomyosarcoma. Soft tissue sarcomas include, but are not limited to aveolar soft part sarcoma, angiosarcoma, epithelioid sarcoma, extraskeletal chondrosarcoma, extraskeletal osteosarcoma, fibrosarcoma, gastrointestinal stromal tumor, liposarcoma, malignant peripheral nerve sheath tumor, Neurofibrosarcoma, rhabdomyosarcoma.

Accordingly, the invention provides methods for detecting cancer or a tumor formation in a subject by administering an effective amount of a conjugate or fusion antibody or functional fragment of the invention to a subject in need thereof. In some aspects, the detection method can further include assaying the expression of a GD2 on the cells or a tissue sample of a subject using one or more conjugates or fusion antibodies or functional fragments of the invention that bind to GD2; and comparing the level of the GD2 with a control level, e.g., levels in normal tissue samples (e.g., from a subject not having a disease, or from the same subject before disease onset), whereby an increase in the assayed level of GD2 compared to the control level of the GD2 is indicative of the disease. Such diagnostic methods can allow health professionals to employ preventative measures or aggressive treatment earlier than otherwise possible thereby preventing the development or further progression of the disease.

An antibody or functional fragment of the invention can also be used to assay GD2 antigen levels in a biological sample using classical immunohistological methods as provided herein or as well known to those of skill in the art (e.g., see Jalkanen et al., 1985, J. Cell. Biol. 101:976-985; and Jalkanen et al., 1987, J. Cell. Biol. 105:3087-3096). Other antibody-based methods useful for detecting GD2 include immunoassays, such as the enzyme linked immunosorbent assay (ELISA) and the radioimmunoassay (MA). Suitable antibody assay labels are known in the art and include enzyme labels, such as, glucose oxidase; radioisotopes, such as iodine (¹²⁵I, ¹²¹I) carbon (¹⁴C), sulfur (³⁵S), tritium (³H), indium (¹²¹In), and technetium (⁹⁹Tc); luminescent labels, such as luminol; and fluorescent labels, such as fluorescein and rhodamine, and biotin.

In one aspect, the invention provides for the detection and diagnosis of disease in a human. In one embodiment, diagnosis includes: a) administering (for example, parenterally, subcutaneously, or intraperitoneally) to a subject an effective amount of a conjugate or fusion protein of the invention that binds to GD2; b) waiting for a time interval following the administering for permitting the conjugate or fusion protein to preferentially concentrate at sites in the subject where GD2 is expressed (and, in some aspects, for unbound conjugate or fusion protein to be cleared to background level); c) determining background level; and d) detecting the conjugate or fusion protein in the subject, such that detection of conjugate or fusion protein above the background level indicates that the subject has a disease. Background level can be determined by various methods including, comparing the amount of conjugate or fusion protein detected to a standard value previously determined for a particular system.

It is understood that the size of the subject and the imaging system used will determine the quantity of imaging moiety needed to produce diagnostic images and can be readily determined by one of skill in the art. For example, in the case of a radioisotope conjugated to an antibody or functional fragment of the invention, for a human subject, the quantity of radioactivity injected will normally range from about 5 to 20 millicuries of ⁹⁹Tc. The conjugate will then preferentially accumulate at the location of cells which express GD2. In vivo tumor imaging is described in S. W. Burchiel et al., “Immunopharmacokinetics of Radiolabeled Antibodies and Their Fragments.” (Chapter 13 in Tumor Imaging: The Radiochemical Detection of Cancer, S. W. Burchiel and B. A. Rhodes, eds., Masson Publishing Inc. (1982).

Depending on several variables, including the type of detectable agent used and the mode of administration, the time interval following the administration for permitting the conjugate to preferentially concentrate at sites in the subject and for unbound conjugate to be cleared to background level is 6 to 48 hours or 6 to 24 hours or 6 to 12 hours. In another embodiment, the time interval following administration is 5 to 20 days or 5 to 10 days. In one embodiment, monitoring of a disease is carried out by repeating the method for diagnosing as provided herein, for example, one month after initial diagnosis, six months after initial diagnosis, one year after initial diagnosis, or longer.

The presence of the conjugate or fusion protein can be detected in the subject using methods known in the art for in vivo scanning. These methods depend upon the type of detectable agent used. A skilled artisan will be able to determine the appropriate method for detecting a particular detectable agent. Methods and devices that can be used in the diagnostic methods of the invention include, but are not limited to, computed tomography (CT), whole body scan such as position emission tomography (PET), magnetic resonance imaging (MM), and sonography. In one embodiment, an antibody or function fragment of the invention is conjugated to a radioisotope and is detected in the subject using a radiation responsive surgical instrument. In another embodiment, an antibody or function fragment of the invention is conjugated to a fluorescent compound and is detected in the subject using a fluorescence responsive scanning instrument. In another embodiment, an antibody or function fragment of the invention is conjugated to a positron emitting metal, such as zirconium (⁸⁹Zr) or any other positron emitting metal provided herein or that is well known in the art to be detectable by positron emission-tomography, and is detected in the subject using positron emission-tomography. In yet another embodiment, an antibody or function fragment of the invention is conjugated to a paramagnetic label and is detected in a subject using magnetic resonance imaging (MRI).

In one embodiment, the invention provides a pharmaceutical composition having an antibody or a functional fragment of the invention and a pharmaceutically acceptable carrier. A pharmaceutically acceptable carrier that can be used in the pharmaceutical compositions of the invention include any of the standard pharmaceutical carriers known in the art, such as phosphate buffered saline solution, water and emulsions such as an oil and water emulsion, and various types of wetting agents. These pharmaceutical compositions can be prepared in liquid unit dose forms or any other dosing form that is sufficient for delivery of the antibody or functional fragment of the invention to the target area of the subject in need of treatment. For example, the pharmaceutical compositions can be prepared in any manner appropriate for the chosen mode of administration, e.g., intravascular, intramuscular, sub-cutaneous, intraperitoneal, etc. Other optional components, e.g., pharmaceutical grade stabilizers, buffers, preservatives, excipients and the like can be readily selected by one of skill in the art. The preparation of a pharmaceutically composition, having due regard to pH, isotonicity, stability and the like, is within the level of skill in the art.

Pharmaceutical formulations containing one or more antibodies or functional fragments of the invention provided herein can be prepared for storage by mixing the antibody having the desired degree of purity with optional physiologically acceptable carriers, excipients or stabilizers (Remington's Pharmaceutical Sciences (1990) Mack Publishing Co., Easton, Pa.), in the form of lyophilized formulations or aqueous solutions. Acceptable carriers, excipients, or stabilizers are nontoxic to recipients at the dosages and concentrations employed, and include buffers such as phosphate, citrate, and other organic acids; antioxidants including ascorbic acid and methionine; preservatives (such as octadecyldimethylbenzyl ammonium chloride; hexamethonium chloride; benzalkonium chloride, benzethonium chloride; phenol, butyl or benzyl alcohol; alkyl parabens such as methyl or propyl paraben; catechol; resorcinol; cyclohexanol; 3-pentanol; and m-cresol); low molecular weight (less than about 10 residues) polypeptides; proteins, such as serum albumin, gelatin, or immunoglobulins; hydrophilic polymers such as polyvinylpyrrolidone; amino acids such as glycine, glutamine, asparagine, histidine, arginine, or lysine; monosaccharides, disaccharides, and other carbohydrates including glucose, mannose, or dextrins; chelating agents such as EDTA; sugars such as sucrose, mannitol, trehalose or sorbitol; salt-forming counter-ions such as sodium; metal complexes (e.g., Zn-protein complexes); and/or non-ionic surfactants such as TWEEN™, PLURONICS™ or polyethylene glycol (PEG).

Thus, in some embodiments, the invention provides a method for treating or preventing a disease in a subject in need thereof. The methods of the invention can include administering a therapeutically effective amount of a pharmaceutical composition provided herein to the subject. For example, the pharmaceutical composition can include one or more antibody or functional fragment provided herein. Diseases that can be treated or prevented using the methods of the invention include cancer, tumor formation and/or metastasis. In particular, the methods of the invention are useful for treating cancers or tumor formation wherein the cancer cells or tumor expresses GD2. Non-limiting examples of cancers or tumors that can be treated or prevented using the methods of the invention include neuroblastoma, osteosarcomas and other subsets of sarcomas, melanomas, gliomas, small cell lung cancer, breast cancer, medulloblastoma, and astrocytoma. Other types of sarcomas include, but are not limited be soft tissue sarcoma, chondrosarcoma, liposarcoma, and leiomyosarcoma. Soft tissue sarcomas include, but are not limited to aveolar soft part sarcoma, angiosarcoma, epithelioid sarcoma, extraskeletal chondrosarcoma, extraskeletal osteosarcoma, fibrosarcoma, gastrointestinal stromal tumor, liposarcoma, malignant peripheral nerve sheath tumor, Neurofibrosarcoma, rhabdomyosarcoma. Breast cancer stem cells are also known to express GD2. Battulal V L et al., Ganglioside GD2 identifies breast cancer stem cells and promotes tumorigenesis. J CLIN INVEST. 122(6):2066-2078 (2012).

Accordingly, in some aspects, the invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable heavy chain (VH) domain, the domain having VH CDR1, VH CDR2 and VH CDR3 amino acid sequences, wherein the VH CDR1 amino acid sequence is selected from the group consisting of residues 26-33 of SEQ ID NO: 2; residues 26-33 of SEQ ID NO: 6; residues 26-33 of SEQ ID NO: 10; residues 26-33 of SEQ ID NO: 14; residues 26-33 of SEQ ID NO: 18; residues 26-33 of SEQ ID NO: 22; residues 26-33 of SEQ ID NO: 26; residues 26-33 of SEQ ID NO: 30; residues 26-33 of SEQ ID NO: 34; residues 26-33 of SEQ ID NO: 36; and residues 26-33 of SEQ ID NO: 40; the VH CDR2 amino acid sequence is selected from the group consisting of residues 51-58 of SEQ ID NO: 2; residues 51-58 of SEQ ID NO: 6; residues 51-58 of SEQ ID NO: 10; residues 51-58 of SEQ ID NO: 14; residues 51-58 of SEQ ID NO: 18; residues 51-58 of SEQ ID NO: 22; residues 51-58 of SEQ ID NO: 26; residues 51-58 of SEQ ID NO: 30; residues 51-58 of SEQ ID NO: 34; residues 51-58 of SEQ ID NO: 36; and residues 51-58 of SEQ ID NO: 40; and the VH CDR3 amino acid sequence is selected from the group consisting of residues 97-109 of SEQ ID NO: 2; residues 97-109 of SEQ ID NO: 6; residues 97-108 of SEQ ID NO: 10; residues 97-108 of SEQ ID NO: 14; residues 97-108 of SEQ ID NO: 18; residues 97-108 of SEQ ID NO: 22; residues 97-109 of SEQ ID NO: 26; residues 97-109 of SEQ ID NO: 30; residues 97-110 of SEQ ID NO: 34; residues 97-110 of SEQ ID NO: 36; and residues 97-108 of SEQ ID NO: 40.

In some other aspects, the invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable heavy chain (VH) domain, the VH domain having VH CDR1, VH CDR2, and VH CDR3 amino acid sequences selected from the group consisting of residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 2; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 6; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 10; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 14; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 18; residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 22; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 26; residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 30; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 34; residues 26-33, residues 51-58, and residues 97-110 of SEQ ID NO: 36; and residues 26-33, residues 51-58, and residues 97-108 of SEQ ID NO: 40.

In yet other aspects, the invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable heavy chain (VH) domain, the VH domain having an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40.

In some embodiments, the invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable light chain (VL) domain, the VL domain having VL CDR1, VL CDR2 and VL CDR3 amino acid sequences, wherein the VL CDR1 is selected from the group consisting of residues 27-37 of SEQ ID NO: 4; residues 27-37 of SEQ ID NO: 8; residues 27-38 of SEQ ID NO: 12; residues 27-38 of SEQ ID NO: 16; residues 27-38 of SEQ ID NO: 20; residues 27-38 of SEQ ID NO: 24; residues 27-37 of SEQ ID NO: 28; residues 27-37 of SEQ ID NO: 32; residues 27-32 of SEQ ID NO: 38; and residues 27-38 of SEQ ID NO: 42; the VL CDR2 is selected from the group consisting of residues 55-57 of SEQ ID NO: 4; residues 55-57 of SEQ ID NO: 8; residues 56-58 of SEQ ID NO: 12; residues 56-58 of SEQ ID NO: 16; residues 56-58 of SEQ ID NO: 20; residues 56-58 of SEQ ID NO: 24; residues 55-57 of SEQ ID NO: 28; residues 55-57 of SEQ ID NO: 32; residues 50-52 of SEQ ID NO: 38; and residues 56-58 of SEQ ID NO: 42, and the VL CDR3 is selected from the group consisting of residues 94-102 of SEQ ID NO: 4; residues 94-102 of SEQ ID NO: 8; residues 95-103 of SEQ ID NO: 12; residues 95-103 of SEQ ID NO: 16; residues 95-103 of SEQ ID NO: 20; residues 95-103 of SEQ ID NO: 24; residues 94-102 of SEQ ID NO: 28; residues 94-102 of SEQ ID NO: 32; residues 89-97 of SEQ ID NO: 38; and residues 95-103 of SEQ ID NO: 42.

In some aspects, the present invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable light chain (VL) domain, the VL domain having VL CDR1, VL CDR2, and VL CDR3 amino acid sequences selected from the group consisting of residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 4; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 8; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 12; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 16; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 20; residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 24; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 28; residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 32; residues 27-32, residues 50-52, and residues 89-97 of SEQ ID NO: 38; and residues 27-38, residues 56-58, and residues 95-103 of SEQ ID NO: 42.

In some other aspects, the present invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof, wherein the antibody or functional fragment binds to GD2 and has a variable light chain (VL) domain, the VL domain having an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42.

In some embodiments, the present invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain and a variable light chain (VL) domain, wherein the VH domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 2; SEQ ID NO: 6; SEQ ID NO: 10; SEQ ID NO: 14; SEQ ID NO: 18; SEQ ID NO: 22; SEQ ID NO: 26; SEQ ID NO: 30; SEQ ID NO: 34; SEQ ID NO: 36; and SEQ ID NO: 40; and the VL domain has an amino acid sequence selected from the group consisting of SEQ ID NO: 4; SEQ ID NO: 8; SEQ ID NO: 12; SEQ ID NO: 16; SEQ ID NO: 20; SEQ ID NO: 24; SEQ ID NO: 28; SEQ ID NO: 32; SEQ ID NO: 38; and SEQ ID NO: 42.

In some other embodiments, the present invention provides a method for treating cancer or a tumor formation in a subject in need thereof by administering a therapeutically effective amount of a pharmaceutical composition having an antibody or functional fragment thereof that binds to GD2, the antibody or functional fragment thereof including a variable heavy chain (VH) domain and a variable light chain (VL) domain, wherein the VH domain and the VL domain respectively have an amino acid sequence from the group consisting of SEQ ID NO: 2 and SEQ ID NO: 4; SEQ ID NO: 6 and SEQ ID NO: 8; SEQ ID NO: 10 and SEQ ID NO: 12; SEQ ID NO: 14 and SEQ ID NO: 16; SEQ ID NO: 18 and SEQ ID NO: 20; SEQ ID NO: 22 and SEQ ID NO: 24; SEQ ID NO: 26 and SEQ ID NO: 28; SEQ ID NO: 30 and SEQ ID NO: 32; SEQ ID NO: 34 and SEQ ID NO: 38; SEQ ID NO: 36 and SEQ ID NO: 38; and SEQ ID NO: 40 and SEQ ID NO: 42.

Formulations, such as those described herein, can also contain more than one active compound as necessary for the particular disease being treated. In certain embodiments, formulations include an antibody or functional fragment of the invention and one or more active compounds with complementary activities that do not adversely affect each other. Such molecules are suitably present in combination in amounts that are effective for the purpose intended. For example, an antibody or functional fragment of the invention can be combined with one or more other therapeutic agents. Such combined therapy can be administered to the subject concurrently or successively.

Thus, in some embodiments, invention provides a method for treating or preventing a disease by administering a therapeutically effective amount of a pharmaceutical composition provided herein to a subject in need thereof, wherein the pharmaceutical composition includes an antibody or functional fragment of the invention and a second therapeutic agent. The appropriate second therapeutic agent can be readily determined by one of ordinary skill in the art as discussed herein. In one aspect, the second therapeutic agent is a chemotherapeutic agent or an immunotherapeutic agent.

The pharmaceutical compositions provided herein contain therapeutically effective amounts of one or more of the antibodies of the invention provided herein, and optionally one or more additional therapeutic agents, in a pharmaceutically acceptable carrier. Such pharmaceutical compositions are useful in the prevention, treatment, management or amelioration of a disease, such as cancer or tumor formation, or one or more of the symptoms thereof.

The pharmaceutical compositions can contain one or more antibodies or functional fragments of the invention. In one embodiment, the antibodies or functional fragments are formulated into suitable pharmaceutical preparations, such as sterile solutions or suspensions for parenteral administration. In one embodiment, the antibodies or functional fragments provided herein are formulated into pharmaceutical compositions using techniques and procedures well known in the art (see, e.g., Ansel (1985) Introduction to Pharmaceutical Dosage Forms, 4^(th) Ed., p. 126).

An antibody or functional fragment of the invention can be included in the pharmaceutical composition in a therapeutically effective amount sufficient to exert a therapeutically useful effect in the absence of undesirable side effects on the subject treated. The therapeutically effective concentration can be determined empirically by testing the compounds in in vitro and in vivo systems using routine methods and then extrapolated therefrom for dosages for humans. The concentration of an antibody or functional fragment in the pharmaceutical composition will depend on, e.g., the physicochemical characteristics of the antibody or functional fragment, the dosage schedule, and amount administered as well as other factors well known to those of skill in the art.

In one embodiment, a therapeutically effective dosage produces a serum concentration of an antibody or functional fragment of from about 0.1 ng/ml to about 50-100 μg/ml. The pharmaceutical compositions, in another embodiment, provide a dosage of from about 0.001 mg to about 500 mg of antibody per kilogram of body weight per day. Pharmaceutical dosage unit forms can be prepared to provide from about 0.01 mg, 0.1 mg or 1 mg to about 30 mg, 100 mg or 500 mg, and in one embodiment from about 10 mg to about 500 mg of the antibody or functional fragment and/or a combination of other optional essential ingredients per dosage unit form.

The antibody or functional fragment of the invention can be administered at once, or can be divided into a number of smaller doses to be administered at intervals of time. It is understood that the precise dosage and duration of treatment is a function of the disease being treated and can be determined empirically using known testing protocols or by extrapolation from in vivo or in vitro test data. It is to be noted that concentrations and dosage values can also vary with the severity of the condition to be alleviated. It is to be further understood that for any particular subject, specific dosage regimens can be adjusted over time according to the individual need and the professional judgment of the person administering or supervising the administration of the compositions, and that the concentration ranges set forth herein are exemplary only and are not intended to limit the scope or practice of the claimed compositions.

Upon mixing or addition of the antibody or functional fragment of the invention, the resulting mixture can be a solution, suspension or the like. The form of the resulting mixture depends upon a number of factors, including the intended mode of administration and the solubility of the compound in the selected carrier or vehicle. The effective concentration is sufficient for ameliorating the symptoms of the disease, disorder or condition treated and can be empirically determined.

The pharmaceutical compositions are provided for administration to humans and animals in unit dosage forms, such as sterile parenteral solutions or suspensions containing suitable quantities of the compounds or pharmaceutically acceptable derivatives thereof. The antibody or functional fragment can be, in one embodiment, formulated and administered in unit-dosage forms or multiple-dosage forms. Unit-dose forms refers to physically discrete units suitable for human and animal subjects and packaged individually as is known in the art. Each unit-dose contains a predetermined quantity of the antibody or functional fragment of the invention sufficient to produce the desired therapeutic effect, in association with the required pharmaceutical carrier, vehicle or diluent. Examples of unit-dose forms include ampoules and syringes. Unit-dose forms can be administered in fractions or multiples thereof. A multiple-dose form is a plurality of identical unit-dosage forms packaged in a single container to be administered in segregated unit-dose form. Examples of multiple-dose forms include vials or bottles of pints or gallons. Hence, multiple dose form is a multiple of unit-doses which are not segregated in packaging.

In one embodiment, one or more antibody or functional fragment of the invention is in a liquid pharmaceutical formulation. Liquid pharmaceutically administrable compositions can, for example, be prepared by dissolving, dispersing, or otherwise mixing an antibody or functional fragment as provided herein and optional pharmaceutical adjuvants in a carrier, such as, for example, water, saline, aqueous dextrose, glycerol, glycols, ethanol, and the like, to thereby form a solution. If desired, the pharmaceutical composition to be administered can also contain minor amounts of nontoxic auxiliary substances such as wetting agents, emulsifying agents, solubilizing agents, pH buffering agents and the like, for example, acetate, sodium citrate, cyclodextrine derivatives, sorbitan monolaurate, triethanolamine sodium acetate, triethanolamine oleate, and other such agents. Actual methods of preparing such dosage forms are known, or will be apparent, to those skilled in this art; for example, see Remington's Pharmaceutical Sciences (1990) Mack Publishing Co., Easton, Pa.

Methods for administering a pharmaceutical composition of the invention are well known in the art. It is understood that the appropriate route of administration of a pharmaceutical composition can be readily determined by a skilled clinician. Exemplary routes of administration include intravenous injection, intramuscular injection, intradermal injection or subcutaneous injection. Moreover, it is understood that the formulation of the pharmaceutical composition can be readily adjusted to accommodate the route of administration. The invention also provides that following administration of a pharmaceutical composition of the invention, delayed, successive and/or repeated dosages of one or more pharmaceutical composition as provided herein can be administered to the subject.

The methods of the invention for treating a disease is intended to include (1) preventing the disease, i.e., causing the clinical symptoms of the disease not to develop in a subject that can be predisposed to the disease but does not yet experience or display symptoms of the disease; (2) inhibiting the disease, i.e., arresting or reducing the development of the disease or its clinical symptoms; or (3) relieving the disease, i.e., causing regression of the disease or its clinical symptoms. The methods of the invention for preventing a disease is intended to include forestalling of a clinical symptom indicative of cancer or tumor formation. Such forestalling includes, for example, the maintenance of normal physiological indicators in a subject. Therefore, preventing can include the prophylactic treatment of a subject to guard them from the occurrence of tumor metastasis.

The therapeutically effective amount of the pharmaceutical composition used in the methods of the invention will vary depending on the pharmaceutical composition used, the disease and its severity and the age, weight, etc., of the subject to be treated, all of which is within the skill of the attending clinician. A subject that that can be treated by the methods of the invention include a vertebrate, preferably a mammal, more preferably a human.

It is understood that modifications which do not substantially affect the activity of the various embodiments of this invention are also provided within the definition of the invention provided herein. Accordingly, the following examples are intended to illustrate but not limit the present invention.

Example I Human Monoclonal Antibodies to GD2 have Potent Antitumor Activity

The disialoganglioside GD2 has been found in a wide spectrum of human tumors, including neuroblastoma, osteo sarcomas and other subsets of sarcomas, melanomas, gliomas, small cell lung cancer, breast cancer, medulloblastoma, and astrocytoma. Breast cancer stem cells are also known to express GD2. Battulal V L et al., Ganglioside GD2 identifies breast cancer stem cells and promotes tumorigenesis. J Clin Invest. 122(6):2066-2078 (2012). Gangliosides are ideal targets for monoclonal antibodies (mAb) because of the high antigen density, lack of modulation, relative homogeneity in many tumors and the possibility of up-regulation by cytokines. Accordingly, as described herein, fully human monoclonal antibodies (mAb) against GD2 were generated. Several mAbs were selected based on ELISA and FACS and further characterized. Of the tested antibodies, 1B7, 2H12, 2F7, 2E12, and 31F9V2 showed high levels of complement-dependent cytotoxicity on some cancer cell lines; 1B7, 31F9, 31F9V2, and 2F7 showed high levels of antibody-dependent cell-mediated cytotoxicity on some cancer cell lines; and the antitumor activity was also confirmed in in vivo models. Based on the potential of GD2 as a target for immune attack and their affinity, specificity, and effector functions, anti-GD2 mAb have clinical utility in the treatment of cancer.

Materials, Cells, and Antibodies

Antigens: GD2-PAA-biotin (cat #0832-BP), GM2-PAA-Biotin (cat #0835-BP) and GD3-PAA-biotin (cat #0898-BP) were purchased from Lectinity (Moscow, Russia). Tn-PAA-biotin (cat #01-010), sTn-PAA-biotin (cat #01-059), TF-PAA-biotin (cat #01-023) and sLeA-PAA-biotin (cat #01-044) were purchased from Glycotech (Gaithersburg, Md.). GD2-ceramide, GM2-ceramide, GD3-ceramide, Fucosyl-GM1-ceramide and Globo-H-biotin were obtained from MSKCC (New York, N.Y.). MUC1 peptide-biotin (cat #353951) was purchased from American Peptide Company (Sunnyvale, Calif.). GM3-ceramide (cat #1503) was purchased from Matreya (Pleasant Gap, Pa.). Ceramide antigens were dissolved in Methanol and all others were resuspended in PBS at 1 mg/ml.

Cell Lines: H524, Lan1-luc, BxPC3, SK-MEL19, ST88, LS141, SaO52 cell line were obtained from MSKCC (New York, N.Y.). Capan2 (ATCC, HTB-80), DMS79 (ATCC, CRL-2049), Jurkat (ATCC, TIB-152), SK-MEL28 (ATCC, HTB72), HT29, (HTB-38) and MCF7 (ATCC, HTB22) were purchased from ATCC (Manassas, Va.). TC-71 (AAC516) was purchased from Leibniz Institute DSMZ (Braunschweig, Germany).

Generation of anti-GD2 mAb-producing hybridomas and lymphoblastoid cell lines (LCL): Blood samples were obtained from patients in trials with GD2-/GD3-KLH conjugate vaccine in patients with melonama and GD2-/GD3-/GM2-KLH trivalent vaccine in patients with sarcoma. The melanoma Phase I trial was done at MSKCC while the sarcoma trial was a multicenter, blinded Phase II study. All samples were obtained under respective institutional and FDA approved IRB protocol and IND. Human B cells were isolated from approximately 80-90 ml of blood by RosetteSep Human B Cell Enrichment Cocktail (cat #15024, StemCell Technologies, Vancouver, BC, Canada) using gradient centrifugation on Histopaque-1077 (cat #10771, Sigma, St Louis, Mo.). The B cells were cultured in RPMI-1640 medium (cat #10-040-CV, Mediatech, Manassas, Va.) supplemented with L-Glutamine (cat #25030081, Life Technologies, Carlsbad, Calif.), non-essential amino acids (cat #NE-01), sodium pyruvate (cat #SP-90), vitamin (cat #ME-30), penicillin/streptomycin (PS-20), 10% FBS (cat #FB-01) from Omega Scientific, Tarzana, Calif., and a mixture of stimulants and cytokines. Five to seven days later cells were fused by electrofusion to P3X63Ag8.653 myeloma cells (cat #PTA-8434, ATCC, Manassas, Va.). LCLs were generated by infecting the B cell with EBV (B95-8 culture supernatant) in presence of IL2 and R848 or PS2006. Anti-GD2 producing hybridomas and LCLs were identified using a GD2 specific ELISA.

ELISA: For the biotinylated Antigens: 50 μl/well of NeutrAvidin (cat #31000, Thermo Scientific, Rockford, Ill.) was coated on the ELISA plate (cat #655061, Greiner Bio-One, Monroe, N.C.) at 4 μg/ml and incubated at RT for 2 hrs. The plate was blocked with 1.25% human serum albumin (HuSA) (cat #HA25S, Monobind, Lake Forest, Calif.) for 2 hrs at RT or 4C, O/N. After washing the plate with 0.05% Tween/PBS (PBS-0.05% T) twice, 50 μl/well of biotinylated antigen (final concentration at 2 μg/ml in PBS) or PBS was added and incubated at RT for 30 min or 4° C., 0/N. The plate was washed with PBS-T twice and incubated with 100 μl/well of purified mAbs diluted in 1.25% HuSA at 2 μg/ml for 1 hr at RT. After washing the plate with PBS-0.05% T three times 100 μl/well of secondary antibody, alkaline phosphatase conjugated-anti-human IgG or IgM (1:3000 dilution in 1.25% HuSA, cat #075-1002 and cat #075-1003, respectively, KPL, Gaithersburg, Md.) was added and incubated at RT for 1 hr. The plate was washed four times with PBS-0.05% T. A hundred μl/well pNPP substrate (cat #PI34045, Thermo Scientific, Rockford, Ill.) was added and incubated at RT for 1 hr and the reaction was stopped with 25 μl/well of 2N NaOH.

For the ceramide antigens: 50 μl/well of ceramide antigen (final concentration at 5 μg/ml in EtOH) or EtOH was coated on the 96 well plate (cat #269620, Thermo Scientific, Rockford, Ill.) and incubated at RT over 2 hrs. The plate was washed with PBS once and blocked with 2.5% HuSA at RT for 2 hrs or 4° C., 0/N. The plate was washed with PBS once and incubated with 100 μl/well of purified mAbs diluted in 1.25% HuSA at 2 μg/ml for 1 hr at RT. The plate was washed with PBS twice before adding the 2^(nd) antibody as described above. The plate was washed with PBS-0.025% T three times before adding the substrate.

FACS: The cells were resuspended in 200 μl/tube of PBS/1% BSA (cat #A3059, Sigma, St. Louis, Mo.) at 0.25×10⁶ cells/ml. Purified mAb was added to the tube at 2 mg/ml for IgG or 5 mg/ml for IgM and incubated for 40 min at 4° C. After washing with PBS/1% BSA once 200 μl of Fluorophore conjugated antibody, Alexa488-anti-human IgG (cat #H10120, Life Technologies, Carlsbad, Calif.) or Alexa488-anti-human IgM (cat #A21215, Life Technologies, Carlsbad, Calif.) was added to the tube and incubated for 40 min at 4° C. The cells were washed with PBS/1% BSA twice and analyzed with Guava ExpressPro software using the Guava Personal Cell Analysis-96 (PCA-96) System (Millipore, Billerica, Mass.).

Affinity determination: Affinity constants were determined using the principal of Surface Plasmon Resonance (SPR) with a BiaCore 3000 (GE Healthcare, Piscataway, N.J.). Custom synthesized biotin-labeled GD2-polyacrylamide (GD2-PAA-biotin) was obtained from Lectinity Holdings Inc (Moscow, Russia) and was coupled to a streptavidin coated biosensor chip (SA; Cat #BR100398) according to the manufacturer's instructions. One flow cell blocked with HSA and culture medium containing free biotin was used as a reference cell. The binding kinetic parameters were determined from several known concentrations of antibody diluted in HBS-EP buffer (10 mM HEPES pH 7.4, 150 mM NaCl, 3.4 mM EDTA, 0.005% surfactant P20) using the GD2-PAA-biotin coated flow cell. The curve-fitting software provided by the BiaCore instrument was used to calculate the association and dissociation rates.

CDC Assay: The cells were washed with PBS twice, resuspended in 1 ml of PBS at 10⁶ cells/ml/tube and incubated with 12.5 μl/tube of Calcein AM (1 mg/ml in DMSO) (cat #C3100MP, Invitrogen, Carlsbad, Calif.) at 37° C. for 30 min. The labeled cells were washed with medium containing 10% FBS (complete medium) (cat #FB-12, Omega Scientific, Tarzana, Calif.) twice and resuspended in 1 ml of complete medium. The labeled cells (50 μl/well) were incubated with 100 μl well of mAb diluted in complete medium for 15 min at 4C. 50 μl/well of human complements (cat #IPLA-CSER, Innovative Research, Novi, Mich.) diluted in complete medium were added to the wells and incubated at 37° C. for 90 min. The appropriate final dilution for human complement was pre-determined for each cell line (between 1:5 and 1:16). After a centrifuge at 1600 rpm for 8 min supernatant (100 μl/well) were transferred to a new fluorescence 96 well plate (cat #7605, Thermo Scientific, Rockford, Ill.). Each sample was assessed in triplicate. Control samples that receive NP40 are used to determine maximal killing and samples receiving complement alone serve as baseline. The percentage of killed cells is determined by relative fluorescent units and calculated according to the following formula: % killed=(% sample−% complement alone)/(% NP40−% complement alone)*100.

Antibody-dependent cell-mediated cytotoxicity Assay: ADCC Reporter Bioassay Core Kit (cat #G7010) was purchased from Promega (Madison, Wis.) and the assay was performed according to the instruction manual. Briefly, effector cells (Jurkat from the core kit) and GD2 antigen expressing target cells were washed and resuspended in RPMI1640 medium containing 10% low bovine IgG serum (core kit) at 3×10⁶ cells/ml and 0.5×10⁶ cells/ml, respectively. The target cells (12,500 cells/25 μl/well) were incubated with 25 μl/well of anti-GD2 mAb (final concentration at 5 μg/ml) or medium only, and the effector cells (75,000/25 μl/well) for 17 hrs at 37° C. 100 μl/well of Bio-Glo luciferase assay substrate (core kit) was added and incubated for 10 min. Relative light unit (RLU) was measured by Synergy 2 luminometer (BioTek, Winooski, Vt.). The effector cells and medium only wells served as baseline RLU. Each sample is tested in triplicate.

Internalization Assay: Internalization of anti-GD2 antibodies were evaluated by measuring the cytotoxic activity of mAb and Hum-ZAP secondary conjugate (cat #IT22, Advanced Targeting Systems, San Diego, Calif.) complex against GD2 expressing cell lines, H524 and Lan1-luc. Cells were plated into a 96 well plate (2,000 cells/90 μl/well) and incubated overnight in duplicates. Anti-GD2 antibody was incubated with Hum-ZAP secondary conjugates at RT according to the manufacturer's instruction. Next, 10 μl/well of mAb and Hum-ZAP complex was added to the cells and incubated for 3 days. The final concentration of the mAb was 10 μg/ml. The assay was performed in triplicate. 25 μl of Thiazolyl Blue Tetrazolium Bromide (cat #M5655, Sigma, St Louis, Mo.) solution (5 mg/ml in PBS) was added to each well and incubated at 37° C. After 2 hrs incubation 100 μl/well of solubilization solution (20% SDS/50% N,N-Dimethylformamide, cat #D4551, Sigam, St Louis, Mo.) was added to each well and incubated for another 4 hrs at 37° C. The OD was measured at 570/690 nm and values obtained with medium alone were used for plate background subtraction. Three parallel cultures without antibody were used to normalize the sample values (Sample/Mean Untreated*100).

Internalization Assay using a pH sensitive Intracellular Fluorescent Probe: Goat anti-human IgG F(ab′)2 fragments (Jackson ImmunoResearch, cat #109-006-006) were conjugated with pHAb Amine Reactive Dye (Promega, cat #G9841) according to the manufacturer's protocol. pHAb is a pH sensor dye that shows fluorescence only at acidic pH, which is encountered when the cells take up the antibodies into their lysosomes. In brief, primary antibody (1B7, 31F9, 5A7G3 or no mAb as reagent control) at 6 μg/ml (200 μl/tube) and anti-human IgG F(ab′)2-pHAb at 4.5 μg/ml (200 μl/tube) were incubated at RT for 20 min. H524 or TC-71 cells were re-suspended in RPMI1640+10% FBS+Glutamine+P/S medium at 1.5×10⁶ cell/ml. Two hundred μl of cells were added to the primary plus secondary antibody mixture and incubated for 40 min at 4° C. The cells were centrifuged and re-suspended in 0.5 ml of culture medium, distributed into a 96 well tissue culture plate and incubated at 37° C., 5% CO₂. Samples were taken at 1 hr, 2 hrs, 4 hrs and 24 hrs for flow cytometry analysis using Guava Express Pro software to determine the percentage of positive of cells.

Xenograft transplantation model: Osteosarcoma SaOS2 cells were obtained from ATCC (Cat #HTB-85; Manassas, Va.) and female CB17 SCID mice (5-8 weeks old) were purchased from Taconic (Germantown, N.Y.). SaOS2 cells (1×10⁶) in 0.1 ml complete growth media were injected via the tail vein on Day 0 using a BD insulin syringe with 28G needle (BD, Franklin Lakes, N.J.) into 10 animals per group. 200 μg mAb (1B7 or 31F9) was injected intraperitoneally on days 1, 4, 8, 11, 14, 21 and 28 post tumor cell injection. Survival was monitored daily and Kaplan-Meier survival curves were generated using GraphPad Prism 6.05 (GraphPad Software, San Diego, Calif.).

Ewing's sarcoma TC-71 cells were obtained from the Leibniz-Institute DSMZ GmbH (Braunschweig, Germany) and cultured as recommended. TC-71 cells (0.1×10⁶) in 0.1 ml of BD Matrigel™ Basement Membrane Matrix (Becton Dickinson Bioscience) were injected subcutaneously into the right hind flank of female CB17 SCID mice (5-8 weeks old) on day 0, 5 mice per group. 200 μg mAb (1B7 or 31F9) was injected intraperitoneally on days 1, 4, 8, 11, 14, 21 and 28 post tumor cell injection. Animals in the control group received mock injections with PBS. Mice were monitored for tumor growth twice per week and tumor size was measured by caliper. Tumor volume (mm³) was calculated as length*width*width*0.5.

All procedures were performed under a protocol approved by the Memorial Sloan Kettering Cancer Center Institutional Animal Care and Use Committee.

Immunoglobin cDNA cloning and recombinant antibody expression: Variable region of human mAb heavy and light chain cDNA was recovered by RT-PCR from the individual hybridoma or LCL cell line and subcloned into IgG1 or IgM heavy chain, or IgK or IgL light chain expression vector as described before. Sawada-Hirai, R., et al. Human anti-anthrax protective antigen neutralizing monoclonal antibodies derived from donors vaccinated with anthrax vaccine adsorbed. J IMMUNE BASED THER VACCINES 2(1): 5 (2004). Ig heavy chain or light chain expression vector were double digested with Not I and Sal I, and then both fragments were ligated to form a dual gene expression vector. CHO cells in 6 well-plate were transfected with the dual gene expression vector using Lipofectamine 2000 (cat #11668019, Life Technologies, Carlsbad, Calif.). After 24 hrs, transfected cells were transferred to 10 cm dish with selection medium [DMEM supplemented with 10% dialyzed FBS (cat #26400044, Life Technologies, Carlsbad, Calif.), 50 μM L-methionine sulphoximine (MSX, cat #M5379, Sigma, St Louis, Mo.), GS supplement (cat #58762C, Sigma, St Louis, Mo.) and penicillin/streptomycin (cat #PS-20, Omega Scientific, Tarzana, Calif.)]. Two weeks later MSX resistant transfectants were isolated and expanded. High anti-GD2 antibody producing clones were selected by measuring the antibody levels in supernatants in a GD2 specific ELISA assay and expanded for large scale mAb productions.

Results

Generation of recombinant antibodies: The heavy and light chain variable regions from 11 selected antibodies were recovered by RT-PCR and cloned into full-length IgG or IgM heavy chain, or IgK or IgL light chain expression vectors. Molecular sequence analysis using IMGT/V-Quest (Brochet et al., Nucleic Acids Res., 36:W503-8 (2008)) revealed that the nine selected human anti-GD2 antibodies were derived from three different VH families and all used kappa light chains. These IgG antibodies showed different CDR sequences with 5, 7, 8, 9, 10, or 20 mutations deviating from the germ line, respectively (FIGS. 1-14, 17-21 ; Table 3). The IgM antibody (2E12) also utilizes the kappa light chain and has 3 heavy chain mutations (FIGS. 15-16 ; Table 3). Recombinant antibodies were produced in CHO cell lines in a wave bioreactor system and purified using protein A or hydroxyapatite chromatography for IgG and IgM, respectively. The purified recombinant antibodies retained the properties of the original hybridoma-derived antibodies with respect to ELISA binding and specificity.

TABLE 3 cDNA Classification of selected human anti-GD2 antibodies VH VL Mutations Mutations from CDR from CDR Clone ID VH germline DH (RF) length JH VL germline length JL 1B7 1-3*01 10 2-21*02 (3) 8, 8, 13 4*02 K2-28*01 5 11, 3, 9 JK3*01 2H12 1-3*01 7 2-21*02 (3) 8, 8, 13 4*02 K2-28*01 0 11, 3, 9 JK3*01 1G2 1-46*01 9 2-15*01 (3) 8, 8, 12 4*02 K4-1*01 6 12, 3, 9 JK1*01 1E9 1-46*01 9 3-9*01 (2) 8, 8, 12 4*02 K4-1*01 3 12, 3, 9 JK2*01 1H3 1-46*01 10 2-21*-01 (3) 8, 8, 12 4*02 K4-1*01 0 12, 3, 9 JK1*01 2F5 1-46*01 7 2-15*01 (3) 8, 8, 12 4*02 K4-1*01 1 12, 3, 9 JK1*01 2F7 1-3*01 20 3-3*01 (2) 8, 8, 13 3*02 K2-28*01 4 11, 3, 9 JK1*01 2E12 1-3*01 3 2-15*01 (3) 8, 8, 13 4*02 K2-28*01 4 11, 3, 9 JK2*01 31F9 1-8*01 5 4-23*01 (1) 8, 8, 14 3*02 K1-27*01 5 6, 3, 9 JK1*01 32E2 1-46*03 8 5-24*01 (1) 8, 8, 12 4*02 K4-1*01 1 12, 3, 9 JK2*02

Binding Specificity: In the antigen-specific ELISA assays, seven human anti-GD2 antibodies (1B7, 2H12, 1G2, 2F7, 2E12, 31F9, and 32E2) showed strong reactivity against GD2-PAA conjugate, but not against GD3-PAA, Globo-H, MUC1, Tn-PAA, sTn-PAA, TF-PAA, or SleA-PAA. Three antibodies (1B7, 2H12 and 2F7) also showed cross-activity to GM2-PAA conjugates. Similarly, the seven antibodies also demonstrated strong reactivity with GD2-ceramide conjugate (GD2-cer), but not GD3-ceramide conjugate (GD3-cer), F-GM1-ceramide conjugate (F-GM1-cer), or GM3-ceramide conjugate (GM3-cer).

TABLE 4 Binding of anti-GD2 Antibodies Measured by ELISA GM2- GD2- GD3- sLeA- Clone ID PBS PAA PAA PAA Globo-H MUC1 Tn-PAA sTn-PAA TF-PAA PAA 1B7 0.08 2.54 3.21 0.08 0.08 0.08 0.08 0.08 0.08 0.08 2H12 0.08 2.37 2.98 0.08 0.08 0.08 0.08 0.08 0.08 0.08 1G2 0.09 0.09 2.77 0.10 0.09 0.09 0.09 0.09 0.09 0.09 2F7 0.10 1.03 2.89 0.13 0.12 0.11 0.10 0.10 0.10 0.10 2E12* 0.12 0.38 2.94 0.09 0.08 0.09 0.09 0.09 0.09 0.39 31F9 0.08 0.09 1.36 0.08 0.08 0.08 0.08 0.14 0.08 0.19 32E2 0.09 0.11 2.80 0.25 0.10 0.11 0.14 0.21 0.11 0.11 F-GM1- Clone ID EtOH GM2-cer GD2-cer GD3-cer cer GM3-cer 1B7 0.08 0.82 2.14 0.08 0.08 0.07 2H12 0.08 0.23 1.86 0.08 0.09 0.08 1G2 0.09 0.10 1.45 0.08 0.08 0.08 2F7 0.09 0.12 2.27 0.09 0.08 0.08 2E12* 0.08 0.17 2.06 0.10 0.08 0.08 31F9 0.09 0.09 1.19 0.09 0.10 0.16 32E2 0.09 0.09 0.62 0.11 0.09 0.09 Binding Specificity by ELISA at 2 ug/ml; *IgM

Analysis of tumor cell binding: Cell surface binding is crucial for cytotoxic activity and was therefore tested next for anti-GD2 antibodies 1B7, 2H12, 1G2, 2F7, 2E12, 31F9, and 32E2. Flow cytometry showed strong binding of all seven antibodies to H524, a small cell cancer cell line, to Lan1-Luc, a neuroblastoma cell line, to Hs527T, a breast cancer cell line, and to TC71 and SaOS2, two sarcoma cell lines. Positive binding was also detected between some of the seven antibodies and other cancer cell lines, including pancreatic cancer cells, acute T cell leukemia cells, melanoma cells, and other sarcoma cells. (Table 5).

TABLE 5 Binding of anti-GD2-mAbs to Different Cell Lines Pancreatic Cancer SCLC BxPC3 (5 ug/ml) Capan-2 (5 ug/ml) DMS 79 (5 ug/ml) H524 (5 ug/ml) Clone ID Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive 1B7 5.38 7.3 2.73 5.48 8.09 11.08 61.71 138.69 88.65 799.87 1304.65 99.95 2H12 2.27 2.77 1.85 4.73 11.69 13.84 8.15 16.12 31.45 1919.7 2917.48 97.78 1G2 2.39 3.21 0.73 3.8 5.33 2.65 5.12 9.79 14.66 147.49 228.29 99.48 2F7 2.78 3.22 1.31 3.33 3.95 1.29 4.04 6.11 5.37 526.45 731.9 100 2E12* 3.77 4.55 10.43 18.17 24.72 77.5 15.99 18.85 72.6 456.04 983.34 99.48 31F9 9.94 34.43 67.52 9.8 32.38 37.51 35.06 101.5 70.71 2249.34 3321.89 97.05 32E2 2.26 13.65 62.87 19.94 26.96 82.87 8.92 17.16 35.13 89.53 134.1 98.12 Neuroblastoma Acute T Cell Leukemia Melanoma Lan1-Luc (5 ug/ml) Jurkat (5 ug/ml) SK-MEL 28 (5 ug/ml) SK-MEL19 (5 ug/ml) Clone ID Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive 1B7 634.22 782.54 100 20.43 68.4 64.46 3.35 3.58 1.32 3.32 5.3 8.47 2H12 1181.18 1776.73 100 15.17 72.83 55.62 2.79 3.4 1.45 4.68 7.18 4.52 1G2 109.5 187.99 94.82 3.64 6.89 6.84 3.05 3.5 1.71 3.81 4.33 0.92 2F7 365.29 612.53 99.65 3.68 8.1 8.13 2.76 2.95 0.36 4 4.7 1.49 2E12* 122.66 307.13 94.71 3.9 8.65 8.71 2.73 2.9 0.21 4.58 5.09 2.02 31F9 379.28 751.54 99.63 8.74 30.53 38.13 65.83 85.92 98.64 290.52 329.63 100 32E2 55.99 105.08 86.16 5.16 12.46 18.76 3.71 4.8 6.94 8.99 13.51 35.7 Breast Cancer Colorectal Cancer MCF 7 (5 ug/ml) MDA-MB-231 (5 ug/ml) Hs527T (5 ug/ml) HT29 (5 ug/ml) Clone ID Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive 1B7 93.48 196.08 91.25 76.41 771.46 67.24 125.64 653.11 90.57 4.36 6.85 2.9 2H12 3.26 8.23 4.68 94.58 777.5 73.38 74.66 241.04 90.74 4.67 6.52 1.15 1G2 2.84 3.46 1.02 3.9 4.59 0.74 6.66 13.47 13.87 4.47 5.9 1.66 2F7 2.94 3.51 1.01 9.03 45.09 17.61 14.47 92.7 33.71 4.67 5.83 1.79 2E12* 6.85 7.77 3.69 4.19 4.97 0.93 14.97 56.47 52.2 8.08 13.45 7.55 31F9 4.36 5.2 6.15 109.38 178.36 90.7 110.26 323.89 97.13 4.15 5.33 1.47 32E2 3.77 5.75 7.5 6.02 7.75 3.99 9.71 27.47 27.28 5.29 13.27 5.52 Sarcoma ST88 (5 ug/ml) LS141 (5 ug/ml) TC71 (5 ug/ml) SaOS2 (5 ug/ml) Clone ID Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive Geo-MFI MFI % Positive 1B7 39.34 89.69 87.51 14.32 31.67 69.65 1181.21 1869.11 99.53 890.37 1159.57 99.74 2H12 34.81 69.31 91.8 23.92 37.31 90.78 430.61 820.56 100 731.18 979.77 99.89 1G2 3.49 4.11 2.25 3.4 3.67 0.75 44.57 82.12 95.39 56.16 86.28 96.04 2F7 4.04 6.4 5.74 3.68 4.32 2.22 193.66 377.28 99.44 199.6 317.14 99.63 2E12* 4 9.89 5.15 3.35 3.69 1.68 77.76 209.89 85.59 368.29 664.34 98.98 31F9 165.38 402.28 98.14 54.87 93.62 94.89 128.94 298.18 94.99 897.48 1270.06 100 32E2 5.03 7.13 11.19 5.17 6.03 11.1 40.95 68.1 94.87 124.88 162.96 99.58 *IgM, 2 ug/ml

Affinity measurements: The relative affinity/avidity of the binding to GD2 was probed by SPR using a streptavidin-coated biosensor chip to capture biotinylated GD2-PAA (Table 6).

TABLE 6 Kinetic Parameters for anti-GD2 mAbs mAb KA (1/M) KD (M) ka (1/Ms) kd (1/s) Species Isotype 1B7 1.4 × 10⁹  7.0 × 10⁻¹⁰ 1.5 × 10⁶ 1.0 × 10⁻³ Human IgG1/κ 2H12 3.7 × 10⁸ 2.7 × 10⁻⁹ 6.8 × 10⁵ 1.8 × 10⁻³ Human IgG1/κ 31F9 2.0 × 10⁸ 5.0 × 10⁻⁹ 1.6 × 10⁵ 7.7 × 10⁻⁴ Human IgG1/κ 31F9V2 3.5 × 10⁸ 2.9 × 10⁻⁹ 4.0 × 10⁵ 1.1 × 10⁻³ Human IgG1/κ 32E2 1.1 × 10⁸ 9.3 × 10⁻⁹ 5.0 × 10⁴ 4.7 × 10⁻⁴ Human IgG1/κ 1G2 4.0 × 10⁸ 2.5 × 10⁻⁹ 4.5 × 10⁵ 1.1 × 10⁻³ Human IgG1/κ 2F7 7.0 × 10⁸ 1.4 × 10⁻⁹ 1.1 × 10⁶ 1.5 × 10⁻³ Human IgG1/κ 2E12 9.0 × 10⁹  1.1 × 10⁻¹⁰ 8.9 × 10⁵ 9.9 × 10⁻⁵ Human IgM/κ

CDC activity: To evaluate the functional activity of 1B7, 2H12, 1G2, 2F7, 2E12, 31F9, 31F9V2, and 32E2, we tested their cytotoxic activity with four different cells (H524, Lan1-Luc, Jurkat, and TC-71) in the presence of human serum as a source of complement. 1B7 showed close to 100% killing activity at 10 μg/mL in three of the four cells tested. 2H12, 2F7, 31F9V2, and 32E2 all showed significant levels of CDC activity toward some cell lines. 2E12, an IgM antibody, showed close to 100% killing activity at 5 μg/mL to H524, Lan1-Luc and TC-71, which was expected because IgM antibodies were known to be more effective in complement-mediated cytotoxicity assays.

TABLE 7 Complement Dependent Cytotoxicity Cytotoxicity (%) Clone ID H524 Lan1-luc Jurkat TC-71 1B7 98.09 106.23 69.77 94.54 2H12 54.73 103.76 38.38 NT 1G2 −21.44 −4.97 NT 6.23 2F7 −1.07 79.63 63.56 20.57 2E12* 125.04 103.28 NT 91.29 31F9 10.47 −2.09 −10.28 2.91 31F9V2 72.89 28.9 −3.51 45.33 32E2 −18.43 −8.1 22.48 −25.7 Final concentration: IgGs at 10 ug/ml, IgM at 5 ug/ml; *IgM

Antibody-dependent cell-mediated cytotoxicity: While 2E12 was more potent in the CDC assay, IgG antibodies were known to have antibody-dependent cell-mediated cytotoxicity (ADCC) activity, which is important for tumor killing in vivo. Six anti-GD2 IgG antibodies (1B7, 31F9, 31F9V2, 1G2, 2F7, and 32E2) were tested with five different cell lines (SaOS2, H524, Hs578T, TC71). Treatment with medium only was used as control. High levels of cytotoxicity were measured using 1B7, 31F9, 31F9V2 and 2F7 antibodies, especially with TC71 cell line (FIG. 24 ). 1G2 and 32E2 also showed some, albeit relatively low level activity.

Internalization assay: Internalization of anti-GD2 antibodies were evaluated by measuring the cytotoxic activity of mAb and Hum-ZAP secondary conjugate complex against GD2 expressing cell lines, H524 and Lan1-luc. Cells that internalize the complex die, while noninternalized saporin leaves the cells unharmed. Treatment with medium only was used as control. As shown in FIG. 25 , H524 cells were effectively killed in the presence of 1B7, 31F9, or 31F9V2. Similarly, the Lan1-Luc cells were effectively killed in the presence of 1B7, 1G2, 2H12, 2F7, 31F9, and 32E2 (FIG. 26 ).

Further Internalization Assays were performed using a pH sensitive intracellular fluorescent probe, which directly measured the kinetics of internalization via a PH-sensitive fluorescent tag. FIGS. 27 and 28 demonstrate the kinetics of internatilization of 1B7 and 31F9V2 into H524 (SCLC) cells and TC-71 (Sarcoma) cells. As shown, a significant amount of anti-GD2 antibodies were internalized to both H524 (SCLC) tumor cells and TC-71 (sarcoma) tumor cells, as compared to 5A7G3 (anti-GD3) and the anti-F(ab′)2-pHAb only.

In vivo Models: The antitumor effects of anti-GD2 antibodies were also evaluated in in vivo models. FIG. 29 shows the results of a survival model, wherein the survival of SCID mice engrafted with human SaOS2 (osteosarcoma) xenograft was measured. As demonstrated in FIG. 29 , the percent survival of engrafted mice was significantly increased by the treatment by either 31F9 or 1B7 compared to that in the control group, wherein the mice were injected with PBS only. FIG. 30 shows the results of a subcutaneous tumor model, wherein the growth of human TC-71 (sarcoma) xenograft tumors in SCID mice was measured. As demonstrated in FIG. 30 , the tumor volume in the engrafted mice was significantly reduced by the treatment by either 31F9 or 1B7 compared to that in the control group, where the mice were injected with PBS only.

Accordingly, the above data demonstrate significant potential to suppress or regress established tumors and provide a survival benefit using human anti-GD2 mAb treatment.

Throughout this application various publications have been referenced. The disclosures of these publications in their entireties are hereby incorporated by reference in this application in order to more fully describe the state of the art to which this invention pertains. Although the invention has been described with reference to the examples provided above, it should be understood that various modifications can be made without departing from the spirit of the invention. 

The invention claimed is:
 1. An isolated antibody or antigen binding fragment thereof that binds to GD2, said antibody or antigen binding fragment thereof comprising a variable heavy chain (VH) domain and a variable light chain (VL) domain; wherein said VH domain has VH CDR1, VH CDR2, and VH CDR3 amino acid sequences that comprise residues 26-33, residues 51-58, and residues 97-109 of SEQ ID NO: 30, respectively; and wherein said VL domain has VL CDR1, VL CDR2, and VL CDR3 amino acid sequences that comprise residues 27-37, residues 55-57, and residues 94-102 of SEQ ID NO: 32, respectively.
 2. An isolated antibody or antigen binding fragment thereof that binds to GD2, said antibody or antigen binding fragment thereof comprising a variable heavy chain (VH) domain and a variable light chain (VL) domain, wherein said VH domain has the amino acid sequence of SEQ ID NO: 30; and said VL domain has the amino acid sequence of SEQ ID NO:
 32. 3. The isolated antibody or antigen binding fragment thereof of claim 1, wherein said antibody is a human antibody.
 4. The isolated antibody or antigen binding fragment thereof of claim 1, wherein said antibody or antigen binding fragment is selected from the group consisting of a Fab, a Fab′, a F(ab′)2, a scFV, a diabody, a triabody, and a minibody.
 5. The isolated antibody or antigen binding fragment thereof of claim 1, wherein said antibody is a monoclonal antibody.
 6. The isolated antibody or antigen binding fragment thereof of claim 1, wherein said antibody is an IgG or IgM isotope.
 7. The isolated antibody or antigen binding fragment thereof of claim 6, wherein said IgG antibody is an IgG1 subclass.
 8. A conjugate comprising an isolated antibody or antigen binding fragment thereof of claim 1 conjugated or recombinantly fused to a diagnostic agent, detectable agent or therapeutic agent.
 9. The conjugate of claim 8, wherein said antibody or antigen binding fragment thereof is conjugated or recombinantly fused to a detectable agent.
 10. A pharmaceutical composition comprising the antibody or antigen binding fragment thereof of claim 1 and a pharmaceutically acceptable carrier. 